Car curretly making 700rwhp. Debating whether or not to step up to longtubes from shorties.. has anybody lost power with Kooks shortys oner stock manifolds?
I'm about to change plugs and was looking for suggestions for car that has a Roush supercharger kit w/ 82mm pulley making 10lb of boost.
2011 5.0 w/Roush kit 82mm
Suggested plug?