I have 12 valve cummings diesel and want to increase HP but need more info besides adding bigger exhaust and intake,engine is stock and not electronic and can do my own work,is there any books on this.
@dd a bigger exhaust and intake. Hope this helps.
try a bully dog or a banks powers systembut good louck getting anything out of a 12valve cummins(its cummins by the way not cummings)
