crossover or x-pipe

I think I've written in about 3 different threads now on X vs H, the benefits. How they work. Scavenging. Etc etc etc. You want a definitive answer, look up one of my posts where I go at length to explain scavenging. It's effect. How X/H pipes increase it by letting one bank help scavenge another bank (firing order and all that). And the numerous other points I make. Including a video showing how exhaust flows and the effect X/H pipes have on that.

I won't get that in depth on this response. I'll say this.

Nascar guys run X pipes. One team will spend more in one year on R&D then everyone on this forum combined. They wouldn't run them if there wasn't a benefit. Period.