I know on an LSx series motor you can pick up 8-10 rwhp with nothing more than changing wires..... I know the shop that did the dyno because they thought is was gonna be BS... and YES they were surprized.
[B]1951 McCormick FARMALL M
2007 MINI Cooper S Turbo... new project car
1998 Chevy 3500 Ext cab, long bed, 4x4, duelly, turbo diesel
2004 Harley V-Rod.... sex on wheels
2011 Harley Electra Glide Ultra Limited