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This is from another forum, going from a 2.5" exhaust to a 3" exhaust. There was a little more boost added and the downpipe type was changed from a 2.5 split straight tube downpipe (this is for a gasser) to a 3" split bellmouth downpipe.
Quite an improvement! We cannot see how much was due to the exhaust diameter alone and not to the amount of gain is definitely more than just due to higher boost.
Quite an improvement! We cannot see how much was due to the exhaust diameter alone and not to the amount of gain is definitely more than just due to higher boost.
