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Re: 2.5" Catback versus a 3" Catback? Posted by John Williams [Email] ![]() ![]() In Reply to: Re: 2.5" Catback versus a 3" Catback?, AdamB ![]() ![]() |
I have tested and I know my tuner has tested the saab sport 2.5" cat back and some other 2.5" cat back exhaust and the bottom line was that there was less knock detection with the full 3" cat back system. Less knock means the car can run more timing and boost.
This has been an ongoing argument for a while now and I always try to tell people what I saw with my own eyes and what my tuner, who does know a lot, says. They always tell me, well that was only one to two cars, it may be different on other set-ups and other cars. Ok, that is true, I did not test 10 cars, but on the two cars I saw tested with almost identical hw and sw, the car with the larger 3" had less knock detected. I also know my tuner did a before and after on the same car and came up with the same results... My 2 cents, John
posted by 65.114.20...
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