A friend is looking to put longtubes on his car and was wondering about ground clearance. Does anyone know which ones offer the best ground clearance for a slightly loweres(3/4") car?

 

It's not the headers that cause ground clearance. I have hedman(some denting required). It's where do you put the mufflers after the headers? Your looking at about the thinkness of a 100watt light bulb being able to fit between the mufflers and ground on a stock height car.

You could run vortex cones and tunedowns and have a lot of clearance, but it would be LOUD.