Exhaust Performance?
 

What exhaust is better for performance on engine with streetport or even bridgeport? The 2" dual header, dual presilenser, to RB muffler, or single header
2 1/2" to single presilencer, to RB muffler? I want to build my exhaust for best racing performance but streetable , somewhat, I have a 13B bridgeport engine with holley 650 quick fuel, MSD and 100 shot going in after breakin on engine. thanks for advice.