anyone ever made or bought a 4 to 5 inch oval exhaust system. for an F-body ... I've been thinking of at least a nice custom made 4 inch oval system for my car.

 

Not that easy if you are going over the rear axle.

 

What in the world are running, that calls for a 5" pipe? A diesel?

4" would be the most you'd ever need, and only approaching 600hp. Too big of pies, and you'll lose exhaust velocity, and cost you horsepower.

 

IIRC, oval exhaust is measured at the wide part of the oval.. so 4" oval might be 3" round.. or 3.5"

heres a chart from Dr.Gas

 

GTATransam...have you checked out spintech mufflers website? They offer oval bends that actually look like they'd go over the rear end easier / more clearance than 3" rounds. Just looking at them though, I haven't bought them......."yet".

 

As long as you are going straight up and over the axle it would probably work. The problem comes in if you have to offset to the right or left to clear something. IMHO the offsets take up to much real estate.