How much better is the cat back over an 04 wrx one? and how much more noise will it make? just curious can get one from my buddy... also how are the 06+ cat backs any better then the 04-05?
not sure about your 04 but you can get under there and measure it. What I can tell you is that the STI cat back is 2.5 inch. I can also tell you that the 06 WRX cat back is 2.25 inch. So get under there and measure your cat back portion and see how small it is. Now if it's 2.25 like the 06 then getting the STI cat back would help (although very small) but it does sound a lot better than the WRX quiet exhuast. So if you can get it for free from your friend I would say do it for noise factor alone. If you have to pay for it I probably wouldn't and just spring for a 3 inch aftermarket system. Putting on my SPT cat back it did feel a little better but nothing huge. Also if you look at the spt dyno's the cat back yeilds more than a 3hp gain. Again nothing huge but it's definetly worth it if you can get a cbe for 300 or less (which is possible)
2.5" pipping can support 400hp and 3" is around 600 so unless you are going for over 400hp you dont need to do anything with the exhuast... well unless you just want it to sound louder.
yea im not looking for anything over 300 fly hp. I just cant stand how quiet it is... i need some noise. I dont want anything loud. Just enough to hear. And make it easier to pull out! lol i cant even here where im at... (used to full 3 inch catless DSM)
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