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Why pay for a F.A.S.T. when you can buy a Dorman LS2 (knockoff of F.A.S.T. 90mm cathedral port) for 1/2 the price new. Then go buy an eBay TB for 1/3 the price.
because the dorman is a piece of **** without porting. with porting u may get similar gains as a fast 90, but fast 90s can be had for 650. the porting service brings it pretty much up to that price.