i love my 3 inch exhaust from my turbo back with a resonator where the scuba was and a magnaflow muffler on the rear with just a turn down here is a pic
not visible so not flashy



downpipe

 

Cory,

Do you think replacing the scuba with a resonator is a worthwhile mod for some HP in a NA xB? I like the sound of the Borla axle back, and dont want to get too loud, but if putting in a resonator will free up some ponies Ill do it. After the chip goes in, I was looking at replacing the scuba, then the header down the road.

 

Cheers ! I presume you're aware the scuba includes the main cat, a high flow one according to what ScionFred mentioned earlier. If you replace the scuba with a resonator, your emissions are going to leap upwards -- don't know if that's an issue in your state, maybe not. Going to a header will eliminate the pre-cat, at which point combined, you would be catless.

 

Yeah, thinking about the two cats, it may be best to just replace the headers and leave the scuba alone.

 

IMO the best thing you can do is replace the tiny 1.8" mid-pipe from the scuba to your Borla with 2.25 or 2.5" pipe. Next would be the scuba. You could fit a hi-flow cat and a short resonator in place of the scuba. Alternatively, a header with the scuba tank and 2.25-2.5" back would sound great and flow pretty good for a NA engine. The biggest problem with the scuba (IMO) is the short 1.8" ID exit.

 

i can't imagine the scuba being the main cat, since there is no O2 sensor after it, suggests its just a secondary cat

 

I have a custom shop nearby, he could easily remove that 1.8" pipe and put in a larger one. Is weird they used that smaller size out of the scuba.

 

most shops do not mandrel bent tubing, so be careful, crush bent bigger tubing is no better then mandrel-bent smaller tubing, its actually worse, the countless compression & expansion of the exhaust gases thru each bend reduces the strength of the exhaust gas pulse

 

Yepp, one shop Ive used here does mandrel bend. Be nice if someone just sold a midpipe.

 

well, i'm trying to work on that ;)

 

Hehe. And Ill gladly buy a midpipe if ya come up with one!

 

X2

 

my opinion is fred is saying the absolute truth
i sold him the used cxr pipe and i, like him, its just too loud and not the greatest fit
he also modified it with the 7" round muffler he got from me, still too loud
his measurements on the stock exhaust r right on
as for malibuguy the 7" will tuck but a 6" would be dead on ? is what muffler can u put in there that will keep the roar down because as U,I,&Fred all know when u take that scuba out its just too loud
myself i just dont think a straight thru muffler can do it,but i also found without the backpressure that the scuba provides right there i lost a lot of bottom end power on my n/a motor and i have the strup header,but it was great on the top end (i was running 119mph in 3rd (auto) and never hit the the rev limiter)
so that in mind id be interested in a header back but only if its not too loud and can still
produced some back pressure to the engine,or even just a scuba delete to the axel back

hope this helps people understand whats happening in our exhaust system

 

scionfred was in today getting some more changes

i found out that the inlet on the TRD axleback is 2" (or around 2") then it leads into 2.5" tubing

this means my midpipes will have to go down to 2" at the flange to avoid slamming against a wall going into w/e axle-back people have

so i'm waiting to get a stock car in to take apart, examine & make a decision on what tubing to run, I seriously think any more then 2.25" is only going to hurt low-end response...on n/a 2.4 motors

 

That 7" resonator really works now! Apparently the CXR muffler really sucks because after replacing it with the TRD muffler, my exhaust sounds almost the same as it did with the scuba and tiny oem mid-pipe. It's a little louder and a lot deeper but without the drone, in-cabin body panel resonance or the crappy weezing noises made by the CXR tip silencer.

I'll post a sound clip soon but if my 3"/2.5" straight-thru exhaust is any indication, a good 6" resonator in place of the scuba would sound great with any decent axle-back. As before, Malibuguy did great work and I trust his judgement on exhaust sizing. 2.25" ID for the NA win!

 

Nice stealth exhaust Cory. Your exhaust guy did a nice job of tucking 3" through there. The CXR mid-pipe hangs a lot lower in front of the rear axle. I couldn't help but notice that you have very little gap between the axle and your pipe. Does it hit often?

Prettiest downpipe I've ever seen.

 

You mean something like post #27 on page 2 of this thread?!?

Surprise, surprise, maybe CIONIDE had a good thought... whatcha think FromTheOld?

 

Yeah, that would work. But so would a $75 SS Magnaflow resonator.

 

malibuguy im here in va

my exhaust is all stock accept the header

and it bolts right up to the stock s-pipe

its 2.5" at the donut im pretty sure

im game for letting u use mine as a

test mule if ya need

Fred glad that muffler did the job i had truly thought it would bummer with all the trial and errors tho

 

I don't understand the reasoning for this post at all. I can't really tell if you're joking or if you were offended or something, but whatever, lol.

Whether you were joking or not, since his opinion is the most valuable to you:
It would be cheaper and possibly achieve the same/better muffling abilities.

BTW, just because a certain muffler works to quiet his car down/remove rasp doesn't mean it will for the majority of the people. His car is turbocharged, and the turbo is essentially the best way to quiet a car down, and no, I am not joking. A turbo is a great "muffler"...