Today i got my tires balanced alinde and rotated for free at sears cuz my friend works there. Well ive been havin problems with my alternator so i should have y 140 amp any time now. But i had them check my battery and he hada disconnect my MSD so i jsut put my stock wires back on. Well when i first put my msd on i noticed no difference but when i disconnected it i noticed a loss in power so it does make a deacent ammount of power and makes ythe car rev allot quicker.