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I think Brent said they got about 6rwhp, look at TPIS website and to the catelog pages 126 and 127 to see how the manifold is altered for the oval shape of the TB--I am sure Dave went a step further with porting the manifold-I am thinking of having the TPIS mounted to a FAST intake when they finially come out. and I agree with Brent--Dave is always ready to discuss possiblities and will be a very informative call for sure---