X pipe H pipe or side by side

The part that is getting lost here also is what RPM range do you use most? All these NASCAR and open header examples don't really mean squat for guys wanting street performance. Street or all out drag only it still depends on what you have. I run 452 CID through fenderwell Hooker competition series headers with 18" 3.5" collectors. Those in turn connect to 3" pipe with an X and 3" in and out flow masters that turn down at the axle. Advantage exhaust on the 1/8th mile with the exception of the fact it marginalizes my poor suspension.