yes, the 3 port that I run is a modded rippadiculous by rb mods. the low end is easy for me to drive.The 5ports I have are stock. They are in my opinion made more for truggy then buggy. all tho I do use one in my jammin x-2 buggy. I just need to use a different clutch setup. The 3 port is hooked to a dynamite 086 pipe and has never ran out of leg on a straight. The thing I like most about my 3 port is run times. 13-14 minutes using byrons gen 2 30% nitro. One thing about these engines from the 3-7 ports is the head shimming and carb tuning. they are all different. Even from engine to engine in the same group..like 2 5 ports.