Exhaust Pipe Diameter 273

With 40 series flow masters, don't plan on listening to the radio or anything other than exhaust drone. The single left to right strap under pre 68 fuel tank will likely be in the way. There are routes around it but I thought I should mention it just so you know what's in store.
A good bit of restriction exists in those stock manifolds so dual pipes wont have much effect on performance.