i put on the gt40 upper and lower intake with 65 mm tb off an explorer.. the car didnt gain anything.. actaully may have loss a bit, why is this? I think its because i still have my stock exhaust.. could it be anything else also ??? thanks
If you put the Explorer intake onto a stock 5.0 engine, then nope... you won't gain much. Those heads are restrictive, and you haven't changed the pumping characteristics of the engine with better heads or cam.
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