Exact HP gains are always a huge debate and don't always mean much.
The big deal about a tune isn't just a HP thing, it changes the way the engine performs and runs. You feel a real difference across the board. It's really a noticeable difference.
Chevy runs deep, don't step in Chevy.
chevy runs deep, Don't step in chevy!
67 Coupe 289 - TCI C4 w/2k stall; Holley 4150 570cfm; Performer intake; mild cam; Pertronix HEI; 302 heads; Roller Tips; Hedman Tri-Y headers; H-pipe w/Flowmaster 40's; 9 in posi 3.50; 205/50-17F; 225/50-17R.