Quote:
Originally Posted by Ibr8k4vetts
restrictive exhaust, I don't understand that term  Can you please tell me how almost straight pipes are restrictive? I'm NOT trying to be a smart azz, I just don't understand.  |
If you look at most Cobra exhaust systems, you'll see that:
1. The headers go into sidepipes. It's a very sharp 90° bend in that area. Also, the headers don't have collectors, but the sidepipes do...essentially after that sharp 90.
2. Most Cobra sidepipe mufflers are tiny inside. They're about 4" on the OD, but you probably couldn't roll a golf ball through most of them. Very restrictive for the engines that are making 450-600hp.
I think it was Ernie (Excaliber) that said this...but he had his car rear wheel dyno'd. He made one pull, then pulled the sidepipes off and made another pull. It gained approximately 100hp.