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Discussion Starter #1
I have an 06 Civic SI and am currently pursuing a great exhaust system on it as I also have a skunk CAI that should run great together. At first I thought all I need is a cat back exhaust but got to looking at my stock cat and it looks as if it’s falling apart. Does anyone know if I buy a high flow cat is that a stock cat replacement and then will be able to hook a cat back exhaust system to that? I know this is pretty elementary to some but just trying to figure it out. Thanks!
 

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Yes if it is a stock cat replacement, it will fit just like stock. I think you are talking about something like the stock header and hfc cat in the top of this picture:
FB_IMG_1530986069363.jpg


The bottom is a race header with the hfc welded in after the header on the other pipe. A cat back exhaust will bolt onto either one.

Here was my old stock setup:
20171026_175212.jpg
 

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Oh awesome!!! Thanks for spelling that out for me that makes perfect sense. I’m wondering also if you go through the trouble to get a high flow cat is it sensible to put it and a cat back exhaust on stock headers? Would there be a noticeable difference going with racing headers? I’m wondering if I got that far if it would be better just to go ahead and get the new headers as well?
 

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Headers will make more of a difference for sure combined with a cat back exhaust. It's all about eliminating the bottleneck. A catback exhaust will just sound good, and a matching bigger pipe diameter header will make more power, but you then need a chip to make it really work, plus an intake. Move air in and out with bigger pipes and tell the computer to breathe more.
 

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From what I've researched a header will truly give you gains compared to exhaust.

There are a couple aftermarket headers available with high flow cats
 

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Discussion Starter #6
Ok awesome. So once I get those things I really need a tune then. Suggest Hondata for that?
 
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