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i had 2/12 installed from front to back. leaveing the stock down pipe because it was much less expensive than changing it. there's no cat only a 21/2 free flow at the rear. i was told that the 3" down pipe was the way to go but was unable to get anyone to give me the correct back pressure formula to prove the 3" downpipe correctness. my theroy is if the exhust gasses get out fast enogh without restriction and with some back pressure then why 3".
posted by 209.214.148.1...
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