Re: Help with large exhaust please
Air condenses as it cools, the further from the heads the exhaust gets the cooler it gets. By the time it gets through the mufflers it's a lot cooler than say at the header. I don't have all the math to support this but the 2.5" out and over the axle should not restrict the 3" into the muffler. So no 3" to 2.5" is not the same as running 2.5" the entire way.
If you really want the 3" all the way I bet you will find guys are doing it with mandrel bent tubing which would have no crimping at all.
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