Hello,
I have the following modifications: C&L Racer Intake, Delete Plates, FRPP Hot Rod Cams, Pypes LT w/ off-road H, and 4.10 gears on a 07 GT manual. Dyno numbers are below 300rwhp on Mustang Dyno. Tuner changed the spark plugs and it didn't make any difference either. Also previous tune was...