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i will try to make a video on everthing and sound. stock cats with magna flow straight threw muffer. and cold air intake. the tune gave me a 27 horse gain at 3,500rpm that was the biggest gain area. the 4.6 power curve dies at just over 3,000. so ya i run low 15's in a quarter mile. with my big tires on!!! coils r there just for the tune... harder spark for the 91 oct tune. bang for ur buck tho is cold air!!! inless u have cold air and exhuast the tune makes it crazy to drive in the rain!!!
So you have the OEM cats on with no muffler?
Which CAI (Cold Air In-take) do you have? K&N?
Does your custom tune "wake up" the motor?
Did your MSD coils get rid of the pinging noise?