the NR528xR has sick power, hard to transfer it all to the ground, hard to get it hooked on surface , just restrict it down with smaller carb, like 7.5mm instead of 9mm, the thing is a fuel hog, be aware of that.......I'm not sure on the 3 port, Im sure it will be awesome on low end, it may hit a rpm wall on the straight though, not sure, just tooth up on CB if so......... I'm going to be running the DPS.21 in my CrT, should rock hard, that NR528xR is a great engine though man, nice score Frosty 