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I'm getting closer to the road. I have a '66 Chevy II with a 355 w/671 blower. I will be 70% street and 30% track.

My questions are:

Is there an advantage to 4" exhaust over 3"?

Is an "H" or cross over pipe needed or power benificial?

I am looking at strait back with turn downs or out the side in front of the back tire. Car is back halfed with a 4 LInk. Dr. Gas has low profile oval tubing that helps with ground clearance.

Any and all opinions are appreciated before I spend the bucks.

Thanks, Steve