[MikeB]

Would be interested in looking at the exhaust systems on the new 600+ hp cars, like Dodge Demon and Corvette Z06. It's probably easier to reduce bends on the mid-engine Corvette.

Speaking of Engine Masters, they did a show where they tested several exhaust configurations, and as I recall, having 3-ft lengths of 3-inch straight pipe behind 3-inch collectors was one of the best things you could do. Minimal obstruction on the way to the mufflers.

I'm not challenging Car Craft, but was surprised to hear about their test where over-the-axle tailpipes killed so much power. I've always thought that lots of the energy was given up as heat by the time the exhaust got back that far. I've even heard that in a 2.5" system, using 2.25" tailpipes would not hurt a thing.

Sounds like you've done some HVAC work. At my last job, one of the items our company sold was flow meters. Learned all kinds of things about properly sizing piping and how piping bends affect flow & flow measurement. Bends play havoc with flowmeters, so a meter typically need to be a certain number of pipe diameters downstream and even upstream from bends to make accurate readings.