Not Ranked
Rare Iron is on the right track. There are TWO factors involved in exhaust gas extraction - volume and velocity. Everybody seems to be concerned about volume restrictions i.e. pipe size. Probably because it is easier to make a bigger pipe. The real science (and flow results) is in the area of merging four 2" pipes into one 3" pipe. Like many things in life that are good, this merger needs to be long and smooth.
Unfortunately, you need to give up the authentic look if you want smooth exhaust merging. You need to use the same collection techniques that have been proven at the races.
Good luck,
Brian
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