I agree this sounds like it will be a great combo for max HP, and may consider a similar setup myself in the future. However, I would assume porting & deleting the cats would give you the largest volume increase as well. Tork's Stinger is super loud, but they're only concerned with performance so the extra sound isnt a factor. I'm now curious to see how loud the closed bimodal exhaust will be with the ported & deleted cats. I'm looking forward to Tork's final results too, and sure they will break both the 500HP and 11sec 1/4m barriers very soon!