I think an all out dyno comparo is in order....
Back in the days of my drag racing (a '55 handyman wagon - D gasser)... I was taught to spray paint the exhaust beginning just aft of the collector... while it was still "wet" - we'd fire it off and where the paint started to bubble was where we'd place the crossover (before X pipes my friends - long before!).
We didn't have exhaust on the drag cars - back then we just ran open headers - just saying that when I was learning lots of stuff about cars in general was back when I was drag racing and hanging out with people that did stuff like this.
|