Retired back to Bowties
Join Date: Sep 2004
Location: North Pole, Alaska
A Dyno might notice it as well as a 1/4 clock, but you probably won't feel any difference and you'll probably notice a drop in MPG because it sounds cool to open it up more than usual.
That's what I've noticed when people try to get more HP.
1985 1 ton K-5, Detroit diesel, 36" tires (going bigger when money permits), 4-speed manual swap, Rockwell T-case, Hybrid lift, 12.5K winch.