Quote:
300 horsepower wont mean anything except on a roll on the highway.
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Wow, something I actually agree with you on!
FYI, the cobra and the GT40 intakes are almost identical on the inside, and on flow rates. So let your mechanic know that so he doesnt try to tell other people wrong information.
Did your backfire start right after the dyno tune?
Have you checked timing and fuel pressure?