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  1. R

    What A/F for Paxton Viper on 8 psi pulley?

    So, I took JoeCool's old Viper to the dyno, wanted to check the state of the tune before removing the front cats..... The tune, done by A.R.T., was rather lean up top (12.5 to 13.0) from 5000-redline, and I dont feel comfortable with that on cast pistons..... I'm in NO WAY implying that...
  2. R

    Factory Exhaust Manifolds are 1 3/4 primary?

    I was told by Roe Racing that the factory Exhaust Manifolds feature 1 3/4 primaries from the factory? Can anyone else confirm this? If so, I'm just going to install a 3" catless Midpipe in addition to the existing Corsa Cat-back and call it good... Thanks in advance!
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