Oh yeah, right, BTO. The 70's are kinda a blur for me nowadays. Anyway, rock on! I had the SE Pro II's on my 1200C Sporty. Sounded a lot like the Cycle Shack slip-on I had on my FLSTNI. Loud, raspy, lots of snap-crackle-an-pop. The V&H's throw more bass. They roar when you get on them and can get pretty freakin' loud with the stock baffles and I love 'em. They made noticeably more power than my C/S pipes mid and top end. I bounce it off the 6200 rev limiter all the time now, never did with my slip-ons. I think it's the header pipe and crossover chamber but what do i know. I do know the V&H's had it running leaner than the C/S on the dealer Stage 1 download, so much so that I had the throw a DFO fueler on there immediately after switching up. If I had it to do over again I might go with the PCIII for more control. My mileage went in the toilet with the DFO. But I do love the V&H pipes!