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In various shows they use a 600hp and 350hp mill to test this stuff
In newer seasons they are a lot more thorough and probably would have rejetted. And it would have shown the 2.5" didn't lose that much. They...
That's an oldie. Wish they had rejetted for both exhaust systems, would have been less difference
I thought they tested different tailpipe sizes? Or was it just the full system?
There are some great engine masters tests on all this stuff
Not a direct answer, but make sure your guy has the right tooling to bend 3". I had a guy tell me he could do 3" but he really couldn't and I got...
If you don't have a subscription to motortrend online get one and watch engine Masters, they've done a bunch of exhaust tests
Do you have full tail pipes? Best move to reduce inside noise
Supports off engine mounts are a good choice, something on the engine not the body.Not sure what someone would have done to melt a cast manifold...
Headers can work but you definitely need to support the weight other than the headers. I used upside down rv manifolds on my fury. Front facing...
one on the left looks truck shaped to me