I have 05 Mustang Gt, looking to change OEM Coil on Plug with Summit Coil on Plug and they say it is400% increase in spark. Price $269.00 range. Granatelli offers theirs at $400. plus. Is it worth the money, are either mentioned above comparable? Or is someone doing it better.don05

 

What other mods do you have? If your engine is mostly stock then the factory COP works just fine

 

yes its a blown 4.6 but from what I have seen its better to stay with the OEM COP, Granatelli's seem to need more work and I am not looking for trouble.I have learned you can't believe a thing most of these companies say about a product they are pushing.Thanks for the reply.Don