what kind of mufflers and how big exhaust?

[2quick]

what size exhaust and what brand /type of mufflers will give the best performance

 

[tyrod]

Straight thru design muffler (dynamax welded race magnum, ultraflo,bullets: Magnaflow makes that design also), 3" mandrel bend style downpipe, and 2.5" mandrel bent duals have gone 9 sec. quarters.