2nd H-Pipe farther down "stream"
Posted: Fri Aug 05, 2022 12:25 pm
Hello,
Current Exhaust on my 385 SBC. on my 73 vette so overall length isn't too bad. Header collectors (3") flow into 3" exhaust pipe for leading 4'. Then by the rear cross member, it tapers down to 2-1/2", which continues through FM super 40s and a short 2-3/3" tail pipe. All bends are mandril. H-Pipe is located up front as near the collectors as possible. 12:1 compression and the system is pretty quiet with no annoying drone. I am thinking of adding another H-pipe farther back, in front of the mufflers. I thought years ago, I read an article that tested this Jim Hand Pontiac Performance?) and there were measurable gains, along with a slight decibel reduction. I have the materials, car lift and equipment. I am I wasting my time? much thanks. Jim
Current Exhaust on my 385 SBC. on my 73 vette so overall length isn't too bad. Header collectors (3") flow into 3" exhaust pipe for leading 4'. Then by the rear cross member, it tapers down to 2-1/2", which continues through FM super 40s and a short 2-3/3" tail pipe. All bends are mandril. H-Pipe is located up front as near the collectors as possible. 12:1 compression and the system is pretty quiet with no annoying drone. I am thinking of adding another H-pipe farther back, in front of the mufflers. I thought years ago, I read an article that tested this Jim Hand Pontiac Performance?) and there were measurable gains, along with a slight decibel reduction. I have the materials, car lift and equipment. I am I wasting my time? much thanks. Jim