CORRECTAMUNDO!kwilford said:I believe that was addressed by RallyBob during an earlier discussion on exhaust tuning. The length of the pipes before they reconnect has a substantive effect on exhaust gas "scavenging", whereby the pulse from one cylinder actually "pulls" gases from another. And the length is somewhat inversely proportional to the rpm at which optimum scavenging occurs. Bob's recommendation was to lengthen the pipes before they merge by 10 inches from stock, in order to get optimum scavenging (and hence usable torque) at normal street engine rpm. But, if I recall correctly, his advice was to NOT contemplate running a dual exhaust system back from the manifold.
Any other comments?
Without going the "primary pipe lengthening" route, the best place to cut is B or C depending on the exhaust pipe diameter used, B for 2.25" pipe or C for 2" pipe. As far as "flex-pipes" are concerned, I like JCW's offerings in various IDs and lengths.