Originally Posted by Vudoo4u2
if you arent catless, run stage 2
if you ARE catless, run stage 3
even if you have exhaust and downpipes, but your exhaust has HFC's or your downpipes do...those count as a catalytic converter, so..stage 2
I don't know that it's so simple. Shiv's recommendations don't factor in an upgraded FMIC or quasi-catless ops.