Burns and the old HeaderDesign software (now defunct) both kicked out a single exit with a y pipe for my car (V8) as well. The exhaust note on my car is pretty mean, sounds very Winston Cupish as I think the basic design is that merge collector system than Runt Pittman put together with them in the early 90s. I have a number of different diameters in my pipes as well, nice smooth transitions, a y pipe and the a single exit.
I'm pretty convinced the single biggest HP improvement I saw on my car was the exhaust as it is tuned to move the torque peak up and thus peak HP up.
NC Region
1980 ITS Triumph TR8
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