Originally posted by CrispRide: was there any substantial gains???? i thought goin dual on a 4-cylie lowered the back pressure too much and was actually detremental to acceleration and the low end torque but if you say it works great, ill get one !!!! where did you attach it??? down pipe back,cat back???
Not with the SVT exhaust on a Zetec. I actually dynoed before & after. There was no loss. Gains were minimal (1-3 hp at most), but at least it gained something.
