Exhaust sizing
#3
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You will loose a bit of power, but not a lot, and you might like what it does for you in terms of controlling target boost.
I went from a 2.5 inch down pipe connected to the stock exhaust from cat back, to a 2.5 inch downpipe connected to a 3 inch cat back with a resonator and street-ish exhaust. (actually no cat in either case)
Now I have a bit of boost creep, up 2 lbs, which certainly means more power. Although the creep does not always happen. This is a bigger change than you are thinking about (though in the opposite direction).
I thought the car was great before switching to the 3 inch cat back.
The more restrictive exhaust means the waste gate can more easily achieve its intended target boost.
More free flowing means better spool, but the waste gate has to get bigger and better to maintain target control.
I went from a 2.5 inch down pipe connected to the stock exhaust from cat back, to a 2.5 inch downpipe connected to a 3 inch cat back with a resonator and street-ish exhaust. (actually no cat in either case)
Now I have a bit of boost creep, up 2 lbs, which certainly means more power. Although the creep does not always happen. This is a bigger change than you are thinking about (though in the opposite direction).
I thought the car was great before switching to the 3 inch cat back.
The more restrictive exhaust means the waste gate can more easily achieve its intended target boost.
More free flowing means better spool, but the waste gate has to get bigger and better to maintain target control.
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viriiguy
DIY Turbo Discussion
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03-01-2016 01:42 PM