I have a 2005 Scion tC. As of right now I have an Axle Back Exhaust. I just ordered a Megan Racing mid pipe.
Now if I wanted to get rid of my Cats what would I need? I'm thinking a test pipe.

Is that right ?

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the midpipe with get rid of the secondary cat...to get rid of the primary cat, you need to get a header

 

your primary catalytic convertor is actually in your stock header. the secondary O2 sensor on your s-pipe detects whether or not your primary cat in your header is present and functioning. removing your stock header and not runing some type of anti-fouler to trick the secondary O2 sensor into thinking your your cat is working will cause a CEL.

the mid-pipe has a secondary catalytic convertor. but there is no sensor down there thus replacing it won't do anything, your car will never know it left, and it won't cause anything like a CEL.

 

I don't really understand. I'm kinda new with this.

Can u explain a little better?

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Okay...

The Exhaust system of your tC is as follows, from the engine, we have Header, the stock header has a primary O2 (oxygen) sensor that corrects A/F ratios, then at the end of the header is your Primary Catalytic Converter, then is the S-pipe, which has a secondary O2 sensor that reads the exhaust gas to determine if the Primary Catalytic Converter is working. if you swap your OEM (stock original equipment manufacturer) Header for a Racing one, then you will not have a Primary Catalytic Converter, and your secondary O2 sensor will notice the absence, and think that the Cat has failed, and alert you with a CEL (Check Engine Light) to let you know that it thinks there is a problem. then Mid-pipe literally just runs under the car from like the front wheels to the back wheels. It has a small Secondary Catalytic Converter that gets whatever the Primary Catalytic Converter missed and a Resonator which helps reduce the noise of the exhaust. Lastly is the Axelback portion, basically a Muffer and a Tail Pipe that connects to the Mid-pipe and is the exit out the passenger side of the back of the car.

?entiendes?

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the midpipe already deletes one cat. if you want to delete the other, get an aftermarket exhaust manifold.

 

ok um i dont care about the primary cat in the headers ... i dont plan on gettin new headers... so rite now i just have an axle back exhaust ( u kno just the muffler ) i want to put the mid pipe in asap ... and i wanted to get rid of the cat .. but i was unaware about the cat in the headers... so im askin my mid pipe will connect to my muffler , and then run to where....

 

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mid-pipe connects to axelback. mid-pipe just has one tiny cat and resonator.

replacing the mid-pipe with eliminate the secondary catalytic convertor all together.

but if you want to get rid of all your cats as stated in your original post, you would have to replace your header and mid-pipe.

but your exhaust is in four components in this exact order starting from the engine: header, s-pipe, mid-pipe, axelback.

any more questions?

 

lol yea wats a s- pipe. and um are u sayin that the mid pipe i am puttin in has a secondary cat in it? im sorry man i jsut have no clue wat im doin....

 

like drax said... your midpipe is just the pipe from the end of your axleback to the factory s-pipe, which is just before the downpipe/stock exhaust manifold. your axleback will still be on... your exhaust will just be extended to the stock s-pipe. simple as that. bolt on midpipe and boom goodbye cat.

 

ok... think of it this way. this is the stock exhaust path.

STOCK EXHAUST MANIFOLD ---> DOWNPIPE---> S-PIPE---> MIDPIPE--->AXLEBACK--->MUFFLER

get it? so you already have a stock midpipe between your s-pipe and your axleback.. the stock midpipe is where your second cat is located. when you put your new midpipe in there, the second cat will be gone. your new midpipe will NOT have a cat. your stock midpipe had the secondary cat but it will be gone. understand?

 

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no. only the stock mid-pipe has a cat on it. the only exhaust system i know of that offers a cat'ed mid-pipe is dezod. so no, replacing your stock mid-pipe with an aftermarket mid-pipe will mean that your secondary cat will be gone, bye bye etc.

but the secondary cat is tiny, the one in your header is bigger and does most of the work.

 

yes i understand ... umm do i need a new s - pipe to run the mid pipe

 

you shouldn't, but i'm not familiar with the megan product. my tsudo midpipe bolted up just fine to my stock s-pipe.

 

no. s-pipe is just a lenght of "s" shaped pipe connecting the header to the mid-pipe. it has that secondary cat detecting o2 sensor on it.

you can replace it with a better one with mandrel bends instead of crush bends for better exhaust flow.

 

so if i keep the stock s- pipe , would puttin the new mid pipe in be pointless

and will any shop put the mid pipe on cause im hearing they cant do it cause its illegal

 

replacing all of your exhaust components with better aftermarket ones will be better overal than just the mid-pipe and axelback. so it wouldn't be pointless to buy a new s-pipe, but it is a good idea while your doing your exhaust anyway, same with your header.

now, some shops might not want to remove any factory catalytic convertors because it can be illegal, but most shops look the other way. if your car fails emissions or noise pollution inspection, it is your problem, not theirs.

 

no, a midpipe will help regardless. any shop will do it. i've never heard of a shop refusing to do that.. it's a very common exhaust modification.

 

ok so ive already ordered the mid pipe... i have a little extra cash and now u guys have me thinkin of gettin a new s- pipe... now my question is can i keep my stock headers wit a new s- pipe... and will any shop put on an s- pipe

o and back to the mid pipe.... it runs from the rear tires to the front? is it that big of a pipe

 

yes you can keep your stock header. yes any shop will put on an s-pipe. yes the midpipe is a rather long exhaust pipe.