so i plan to replace our huge scuba tank with a magnaflow hi flow cat but i just had some questions

so iv heard ppl do this and they used 2 or more high flow cats
is there any benifit to more than one?
will it make it not as load but breath better?

and if i do replace it will there be an loss of back pressure or torque?

thanks

i think there are several benifits to putting 2 or more hi flow cats in place of the scuba tank. one, it will keep the emissions down, possibly better than stock with 3 (1 or 2 if you're still running the stock exhaust manifold). 2, you'll get a more aggressive exhaust note without it being stupid loud, ricey and calling attention from the po-po's. and C, (hope people caught that) you'll be taking some restriction from the exhaust flow, which in turn will help the engine breath better, boost economy and also cut back on emissions. plus you won't have that stupid tank under the car anymore. i'm running a header (strup baby) which removed the primary cat. its helped my mileage quite a bit, but i don't like the fact that some of the emission system has been removed. this summer, i plan to put 2-3 cats in place of the scuba to help flow, sound and help so my part with the global warming conspiracy (no one take offense, please!!) the only problem with removing any emission system is that a lot of shops don't like to do it if the car has less than 50,000mi on it. in most states its illegal to alter or change the cats prior to that. it can be done, and many have. it all comes down to personal choice. i say do it, but thats just me.

um cats kill power bad i would just run one cat

Your 'scuba tank' is not a cat. That is a muffler. Your cats are in your header (your headers dump directly into your first cat) and down around your mid pipe. Yes there are two already on your exhaust from the factory.

Cats are full of fiberglass that help aid in emissions and DO NOT aid in power. Also cats won't give you a nice sound like whitebreadbox is speaking of.

If you want to free up your exhaust, I suggest changing out your 'scuba tank' with a straight through exhaust muffler (something like a dynomax or magnaflow) and completely removing the resontator in the axel back or replacing it with a higher flow resonator/glasspack.

The choice is yours, but adding cats to your exhaust is probably the worst thing you can do to your exhaust. I suggest keeping your exhaust tubing the same diameter to help aid in bottem end torque along with the free flowing mufflers, cats and resonators. That will give you a nice setup for a much cheaper price than that of a full exhaust system from online.

hey i have more exhaust work done to my car then any one here inside of that scuba tank there is a cat out car has 2 cats one in the resonator and one in the header trust me i know this i was the first person to hack off my resonator we dont need to go there lol i have my stock resonator sitting in my garage there is a cat core in it

omg becky look at her but

oh and by the way cats are made with ceramic metal composite

when ppl say silencer do that refer to a cat? also whats the difference between cat and a resonator?

Cory, I assure you that just because you have "the most done to your exhaust" that doesnt make you more knowlegable than me. I assure YOU that that big scuba tank in the middle of the car is not a resonator. It is a muffler. The cylinder shaped item towards the rear is a resonator. I have yet to take a look at our cats, but I doubt Toyota would put a cat inside of a muffler. I will have to disagree with you until I look for myself.

I understand you think that because you have more exhaust work done, you know more, but that is not necessarily the case.

Oh ad by the way, they are not made of ceramic metal composite. That is a double negative. Ceramic is a clay like substance, while metal is...well a metal. A cat is made of more or less fiberglass. I have gutted many of cat in my 19 years of age and I assure you its fiberglass.

A silencer is a resonator. Usually a silencer has perforated holes along the walls of the pipe and a straight through design.

sorry mr sizzource

i took my car in to Midas to have straight pipe put in place of scuba tank

they called it a Resonator
but couldn't take it off because there is a cat in it

sorry mr sizzource

i took my car in to Midas to have straight pipe put in place of scuba tank

they called it a Resonator
but couldn't take it off because there is a cat in it

1. would it be a good idea just replacing the scuba tank with a one hi flow silencer and delete the 2nd one by the muffler?

2. replace the scuba with a straight through muffler also delete 2nd cat?

3. which one will be the loudest setup?

4. which setup would have a higher flow?

i was thinking of replacing the whole piping and leave it w/ a stock muffler for now just wanna see how loud would this be.

thanks sp2 there is a cat in the mid car resonator and there is a cat in it do i need to say it again there is a cat in the mid car resonator also a cat is made up of

" The term Catalytic Converter covers the stainless steel box mounted in the exhaust system. Inside the cover is the catalyst, a ceramic or metallic base with an active coating incorporating alumina, ceria and other oxides and combinations of the precious metals platinum, palladium and rhodium. The base can be protected from vibration and shock by a resilient ceramic or metallic 'mat'"

your 19 calm down its ok you will be ok get over the fact you just got owned and it will be ok

and daily i had a strup header replaced my resonator with a high flow cat and 2.5 inch pipe and had the trd axle back here is what it sounded like at each step

first stock with no resonator just a high flow cat and trd axle back
http://youtube.com/watch?v=Sp17pP1mM6c


now this is same set up with a strup header on

http://youtube.com/watch?v=l_2dd4PLqOw

i sold the strup header to go with a turbo set up i will be running a straight through 3 inch no muffler no cat unless its god awful loud then i will throw on a glass pack

Your 'scuba tank' is not a cat. That is a muffler. Your cats are in your header (your headers dump directly into your first cat) and down around your mid pipe. Yes there are two already on your exhaust from the factory.

Cats are full of fiberglass that help aid in emissions and DO NOT aid in power. Also cats won't give you a nice sound like whitebreadbox is speaking of.

If you want to free up your exhaust, I suggest changing out your 'scuba tank' with a straight through exhaust muffler (something like a dynomax or magnaflow) and completely removing the resontator in the axel back or replacing it with a higher flow resonator/glasspack.

The choice is yours, but adding cats to your exhaust is probably the worst thing you can do to your exhaust. I suggest keeping your exhaust tubing the same diameter to help aid in bottem end torque along with the free flowing mufflers, cats and resonators. That will give you a nice setup for a much cheaper price than that of a full exhaust system from online.

WOW, i've never heard anything so wrong in my whole entire life... and i've got a few on you bud. the scuba tank is a 3 way cat. it has a catalytic converter and a resonator in one giant package. and a cat having fiberglass in it. HA. http://en.wikipedia.org/wiki/Catalytic_converter and read the technical details. and by removing the 3 way cat/resonator and putting in a high flow (the ones without the fiberglass packing) cat will infact produce more sound and better power. do some homework and research before throwing out info like you've just done.

thanks whitebread lol i didnt want to get to tech with him

Cory, I assure you that just because you have "the most done to your exhaust" that doesnt make you more knowlegable than me. I assure YOU that that big scuba tank in the middle of the car is not a resonator. It is a muffler. The cylinder shaped item towards the rear is a resonator. I have yet to take a look at our cats, but I doubt Toyota would put a cat inside of a muffler. I will have to disagree with you until I look for myself.

I understand you think that because you have more exhaust work done, you know more, but that is not necessarily the case.

Oh ad by the way, they are not made of ceramic metal composite. That is a double negative. Ceramic is a clay like substance, while metal is...well a metal. A cat is made of more or less fiberglass. I have gutted many of cat in my 19 years of age and I assure you its fiberglass.

A silencer is a resonator. Usually a silencer has perforated holes along the walls of the pipe and a straight through design.


WOW cory, sometimes ignorance is bliss. sometimes it makes you want to punch babies. in this case, i'm just laughing at this 19 know it all. its ok though, we know the truth. i just pray this guy never gets a job as a mechanic!!! fiberglass in a cat... HAHA :rofl:

lol mufflers have glass in them lol its ok i think i was the first to start hacking things off my car lol

lol mufflers have glass in them lol its ok i think i was the first to start hacking things off my car lol

yes, you probably were.

i member i get done with the sawsall and take a look down it and say F*(*&^* that sucks lol

haha
wow
look what i started?
i think ima go with 2 hi flow cats
cuz i got the borla dual and has no muffler
and gunna get the weaponr headers when they come out
and i dont want to be freakin 120db of rice

im going to be pretty loud lol no mufflers no cats lol it will be loud oh yes it will with a nasty spooling sound lol

haha
oh mr turbotoaster

i thought about this for a long time but never got around to do it...

yes the scuba tank is a resonator and cat. precision muffler had one cut open and it clearly was a cat. its toyota's way of getting away with low emissions from the fire-breather that is the 2AZ-FE..

i think that if you do double cats it would probably make the same emissions as before but the cost of 1 OBDII cat is like $300... i was going to do a custom setup with 1 cat and 1 resonator to keep sound to a tolerable level and keep the po-pos away

oh also, this isnt exactly legal.. removing any emissions control part is kinda not street legal..

so what is the difference between a cat and a silencer?

a CATalytic converter controls emissions. it reacts with the exhaust and makes it all good for the enviroment.

a silencer/muffler/resonator all describe a part that controls the exhaust sound

are there a such thing as a performance cat? if so where can i get one?
as mention on this thread our xb actually have 2 muffler, 2 cat and a resonator. one cat is connected w/the header. the scuba tank is actually a muffler and a cat combine. then there's a resonator before the axel back is this correct?

if this is correct then would it be a good idea to remove the scuba tank and replace it w/silencer and just run a stock muffler for now? would this setup help increase the airflow?
also i'm planing a going with 2.4" piping.

1. yes there is such thing as a hi perf cat. magnaflow makes a hi flow cat that is OBDII and its about 300 just for the part. ask your local muffler guys for a OBDII hi flow cat and custom piping. there is no application for the xB2 yet so its all custom for now

2. 1 cat with the header 1 resonator/cat. a muffler usually refers to assembly part of the end section of the exhaust system. so that means we have 1 muffler in the axleback.

3. yes thats going to give you some power by removing some back pressure from the resonator/cat. with that setup and the stock header youre going to be running with only one cat which is still acceptable. with you run with that setup and with a aftermarket header youre going to be kinda loud and because you dont have any emissions control, the carbon from the exhaust is going to powder coat your bumper black. also, your going to probably kill everyone that drives behind you with all the CO/NOx etc etc...

there are magnaflow hi flow cats for only $80 idk where ur shopping but sounds like its a lil off

^ very true, BUT they all say "Not For Use On California Registered Vehicles, With Manufacturer's Limited Warranty"... So lame!

I have a catco hi-flow cat on my truck and i was thinking of going with some strup headers a Catco cat and an axel back kit, but i dont want to spend tons of money to have it not pass smog or inspections...

I'm confused, why would you cut out the stock muffler/cat/res to just to put in multiple cats? I completely removed mine and am running dual straight pipes. It sounds amazing. Deep and throaty.

I'm confused, why would you cut out the stock muffler/cat/res to just to put in multiple cats? I completely removed mine and am running dual straight pipes. It sounds amazing. Deep and throaty.

For legality purposes and emssion testing... A good high flow cat with bigger piping and a performance muffler will give you both performance and a good sound too...

is this something i should look into in getting a high flow cat

http://stores.channeladvisor.com/verociousmotorsports/Items/vibcatm?&caSKU=vibcatm&caTitle=Stainless%20Steel%20Vibrant%20Metal%20Core%20Catalytic%20Converter%20Parent

I'm confused, why would you cut out the stock muffler/cat/res to just to put in multiple cats? I completely removed mine and am running dual straight pipes. It sounds amazing. Deep and throaty.

For legality purposes and emssion testing... A good high flow cat with bigger piping and a performance muffler will give you both performance and a good sound too...

Oh, guess I'm lucky that I live in Illinois. I don't have to worry about legality and testing :P

im emissions exempt for a few year so im boosting it

Anyone got a dyno chart on how much gain to expect form a high flow? I dyno'd my old dodge stealth(3.0 dohc non-turbo) after switching to a high flow and got 12whp. I had just an intake for my base pull and then the high flow for the second, some guys with just the high flows report 8-9.

I doubt a 2.4 4cyl would see that much gain but I would love to see something beyond 6. I'm considering doing a cai, strup header to a high flow, a resonator, then trd the rest of the way. So I am trying to get a general idea of what to expect from all that. crossing my finger for more than 20whp. Think that's realistic? Technically where I live I could delete the cat and then I'm very certain I could do it but I hate how loud no cat is, which is why I'm leaning towards high-flow.

CarbonPhiber pulled a gain of like 18hp with intake/header/axleback(?)

i think its safe to say that without the scubatank and straight pipes we can get like 8-10hp. with a cat and a resonator i would say something like 6-8. along with the 18hp or so of the intake & header a gain of 24HP is 16%. try to get that with a s2000! eat your heart out honda boys!! :P

and deleting a cat is always risky.. but in FL i hope your cops arent as evil as the ones we have here in cali.. damn hippies :P

I think I could live with 24hp until I get the money to build up my heads. I remember reading on the tC back in the day someone did staged head upgrades for the 2az but I guess they went out of business. Supposedly there was one making nearly 200hp to the wheels n/a. Not too bad if you want to avoid f/i.

the money that it would take to get to 200 hp will not be worth it

hey i know im going to get 2 maganflow high flow cats for sure
but i was wondering if i should order the 5' long 2.5" Borla straight pipe for the shop to use for rest of mid section
or just get whatever the exhaust shop uses

is there going to be any advantage of the Borla piping over the shops generic piping beside being shinny


heres the link
http://www.jegs.com/i/Borla/157/30350/10002/-1/758362|10263

this looks good so is 5' gonna be enough?

idk haha
gotta do some measuring

i'm thinking maybe 7'-10'. getting 7' would be completely safe and not worry if you gonna run short