I have the Pypes Race Flo 2 1/2 system one my '70 340 Dart, big cam, Edelbrock air gap, 650 AVS, ported j heads and Dougs headers there is some drone around 30-40 mph but not bad at all. Over all it sounds real good, I'm a happy man!
Jeff
Yes I did, but I had the pypes on with the hi-po manifolds and tti 2 1/2 down pipes before I got the dougs and had to do some trimming. I think if I had the dougs the first time around they would have bolted right up with no bending.
Jeff