There is a guy who taught auto shop at Lassen College I think. He has a "48 Chevy with a 235 that pulls a travel trailer all over. I think he's a member. He put his car on the Dyno at school and did a lot of testing on pipe sizes. I think his findings are burried here somewhere on this board. I think his best all around results for the street were with 2 1/4 to 2 1/2 duel pipes. What doesn't work on my 270 is Fentons into a 3" single pipe then a 3"Flowmaster and exiting infront of the rear wheel. It sounds great but I lost a LOT of top end. With the driver side window down it feels like vacuum cleaner is hooked to your ear.
