Hahaha, from what Ive heard the 2660 is an all-out power-pipe! I have the RB 2652 on my T10, and it's powerful, but not overpowering, and it lasts about 6 mins on the right tuning - and that is with the short conical manifold as well. A medium sized one will do me better, but first I have to find it!
Car-less (Velox V10 or 733) // RB T10.5"+" (JB Modified) // Bluebird BMS-990DMG (St) & BMS-631 (T/B) // ATS 16% // Capricorn Wheels // Protoform
"70% of the time, it works ALL the time"