How much of a HP gain am i lookin at (if any) by buying a set of performance igniton coils?

 

Theres stock and well.....STOCK. Your not going to gain anything from swaping "performance" coils. There are some that are like $400/set, but they are basically stock packs and fail just the same.

 

True fact, the stock coils are designed to handle a spark strong enough to support over 400HP.
Now if you had an old chevy and made it a stroker or something then you need to upgrade the coil and wires to get the most horsepower possible, not ture on our cars.