AARHEMI
Full Access Member
back from the dyno got good news and bad news the good news was making great power till---------------- the bad news till we hit wide open throttle then it fell on its face going to have to do a full 3in custom exhaust the factory 2and 1/4 pipe,s and cats are to small was choking the motor it was not letting it breathe and the back pressure was killing the motor making it take a lot of timing out of the motor it was pulling almost 10deg. out and had 9.5 on the vacuum where it should have been like 1-1.5 at wide open so with in the next few weeks where going with the long tube Dynatechs and custom 3in true duals we where making 338.5rwhp and with the timing and back pressure we where losing around 100 rwhp so for every 1deg. of timing it was pulling u lose 10hp