Originally Posted by George Knighton
I think I'd agree with you, in general terms. Logically, a test pipe will yield a couple of horses, but in actual practice, few people tune for it properly so it doesn't make any difference.
I really don't think its worth a 'couple' of HP. I had some dyno charts to show there was no difference, but I can't find them rigth now. It might help a bit, but its not going to be a major restriction unless you are making tremendous horsepower.