I know that switching to aftermarket headers, like Comptech, RM, DC Sports, makes significant gains in Hp with 91-96 NSX's. Are the gains still significant if the header switch was made but the stock exhaust was still used?
There will still be hp gains with this setup, however, as you can imagine, the gain will not be as high if the stock exhaust is maintained. I would take a stab at RWHP of about 15-20 HP.
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