They work good with open exhaust. A friend of mine did it with mufflers on. Didn't work to well. It ended up creating crankcase pressure ! Blew oil out all over the engine. He was running 3" tubes with flowmasters on a 66 mustang, running low tens. Basicly what we had figured out is that there is too much backpressure with mufflers on.
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302,vortech s trim @18-20lbs showing,edelbrock performer heads-o ringed,gt 40 upper&lower, mac 1 5/8"long tubes, sub frame connectors,50/50 rear, 70/30 front, manual rack,3:55 gears, c4 , best time 10.13@135mph
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