Quote:
Originally Posted by Joesurf79
As I poked around with some guys that are familiar with spec miata racing whom I respect, they say they have seen quite an effect (10+ hp gains / losses) on the dyno when testing different diameters and tubing lengths of the exhaust system AFTER the headers... In the low HP NA car world, 10 hp is a huge difference!
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I think there is a bigger difference in the miata since the stock cat back on one of those is sub 2 inch. Stock for us is like 2.25ish.