I’m a big fan of the SR-Y pipe since they introduced it for the Gopro Motorplex series. The biggest plus is that we’re now faster than the Jr’s. I’d venture a guess that at Mooresville, it’s worth about a second a lap (<55 second laps).
It’s definitely got more bottom end, but it doesn’t seem to pull much more on top. We’re still turning about 14,2 on the downhill (same as the 4 hole can), which is nice because there’s little incentive to rev them up to hell (and rebuild them every weekend).