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Ok, I had a Magnaflow hi-flow cat put on a while back ago. After it was installed, the exhuast was louder than before(Trubendz catback with Magnaflow and optimized y). I thought it was an exhaust leak and meant to get it checked out but I honestly got used to the sound and it slipped my mind for a bit. There doesn't seem to be a performance loss which is why I probably didn't make a big deal out of it. ANYWAY, my question is does a hi-flow cat make an exhaust louder or should I get it checked out for leaks? And while I'm posting, I might as well ask if replacing the small 2.25" piece of stock exhaust that is left between the cat and catback with a piece of 2.5" will make any, if small, performance gains?
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Quote:
And while I'm posting, I might as well ask if replacing the small 2.25" piece of stock exhaust that is left between the cat and catback with a piece of 2.5" will make any, if small, performance gains?
Not if you still retain the y with the 2" pipes at the back....  
99 SVTC, T-Red, #652/2760-12.8.1998
Mother#@%@!* did I sound abstract?
I hope it sounded more confusin than that!
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Stock exhaust piping, Omptimized Y pipe and a Magnaflow high flow cat will produce a louder exhaust,
beacuse more air is going through the exhaust system.
Also it's possible that one of the welds didn't get sealed properly.
1996 2.5LT V6 Contour ATX My Tour+help/info pics
E0 rims, Gutted Pre-Cats,CTA Custom Exhaust & Intake, Diablo Chip.
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Originally posted by JonnySVT:
Quote:
And while I'm posting, I might as well ask if replacing the small 2.25" piece of stock exhaust that is left between the cat and catback with a piece of 2.5" will make any, if small, performance gains?
Not if you still retain the y with the 2" pipes at the back....
But that is a different part/issue...What does that have to do with the stock pipe I asked about?
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Originally posted by chongo:
Stock exhaust piping, Omptimized Y pipe and a Magnaflow high flow cat will produce a louder exhaust,
beacuse more air is going through the exhaust system.
Also it's possible that one of the welds didn't get sealed properly.
But I don't have stock exhaust piping except one small little piece, but I see what you are saying. So basically the hi-flow cat will make the car louder, but I still may have a leak? 
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Originally posted by FreeShyne:
Originally posted by JonnySVT:
Quote:
And while I'm posting, I might as well ask if replacing the small 2.25" piece of stock exhaust that is left between the cat and catback with a piece of 2.5" will make any, if small, performance gains?
Not if you still retain the y with the 2" pipes at the back....
But that is a different part/issue...What does that have to do with the stock pipe I asked about?
It has everything to do with it....detailed current exhaust setup please.
99 SVTC, T-Red, #652/2760-12.8.1998
Mother#@%@!* did I sound abstract?
I hope it sounded more confusin than that!
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The detailed current exhaust setup is in my first post :Trubendz Catback with Magnaflow, Magnaflow cat, and optimized Y. Does that help?
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You can change the 2.25" pipe for a 2.5" one, this with allow the air to flow more evenly and less restricted.
I'm not sure if this with be a huge gain in performance, but it will produce a slight increase in
the loudness of your exhaust.
On my setup I have gutted pre cats, y pipe un-optimized, 3" flex pipe, stepped down to 2.5" piping
to the tail pipe. Magnaflow high flow cat and 2 Magnaflow mufflers. This is a single exhaust.
Click on the link in my signature for pics.
1996 2.5LT V6 Contour ATX My Tour+help/info pics
E0 rims, Gutted Pre-Cats,CTA Custom Exhaust & Intake, Diablo Chip.
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I think I'll just take it to a shop and have them replace the one piece of pipe, and they can check for leaks while they're at it.
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i'm putting on my sp motorsports down pipe this weekend, i'll let you know if it makes my car alot louder or alittle louder, i hope a little i want to make it a sleeper 
I reject your reality and substitute my own.
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