Anybody try these? If so did it make a difference or was it a waste of money? They are saying 10hp/tq peak increase and about 5hp average. Thoughts?
http://www.americanmuscle.com/accel-coilplug-1112gt.html?source=igodigital
http://www.americanmuscle.com/accel-coilplug-1112gt.html?source=igodigital