[Ant]

[quote=Dwight;1092160]we need more details on the motor. Have you had the car dyno'ed?

Sidepipe typical lose 40 to 100 hp on a Cobra.

I agree with most of what you have said, but I am wondering how sidepipes typically loose 40 to 100hp on a cobra?
We made a set of headers for my KC Ford Yates 358 based engine which dynoed at well over 600bhp, my headers are stepped and go into Chris Hills merge collectors and back to 3" perf mufflers that I am in the process of making, maybe I should go bigger with 3.5" core mufflers, I have read where too big slows the air flow or just doesnt make a difference!