Quote:
quote:Originally posted by crazyjoe
Quote:
quote:Originally posted by ptgtcb
MexicanPT, I am very glad to hear your system is not reeling it's self back in.[:X]
I feel if we open up the CAT and down pipe to 3" we really do not need a 2.5" all the way back and that the stock exhaust will work with a straight through style muffler. We are removing a lot of the restriction in the exhaust with the downpipe, negating the requirement for the 2.5" exhaust for stage II. The Stage II requirement for 2.5" is only CAT back and retaining the stock CAT!
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Conventional wisdom on exhausts is that you do not want to shrink down as you go along the pipe. As the air cools, if you restrict it more, it will have a bigger impact. No turbo guy I know will suggest going smaller as you head toward the bumper, so I wouldn't recommend it. If you DO do it, let us know how it works, though. 
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Did you even read my post?
Actually with the smaller pipe you are keeping in the heat in the pipe and the gasses are flowing faster. Larger the pipe the sooner the gases cool and slow. My exhaust is also a straight through muffler. The stock cat is choking the heck out of the engine. I think you are going to reduce a lot more back pressure with the CAT/downpipe than with a CAT back exhaust system. BTG got very minimal, if any, gains with a 2.5" over their 2.25 system so I think that should tell you something. LAF said it best, this is a good foundation to an excellent exhaust system.