Stellings boxes

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09-18-2002, 09:39 PM

John B

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Stellings boxes

OK, How much is gained on a 382 with 500EFI's?? I have heard 3-6 MPH. What is most someone has found, with the same loads?
Also has anyone altered the stock mufflers that come with the boxes and what were the results?
Thanks JB

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