I only recommend the 5 port for buggy if its modded and with the smallest restricter carbon clutch and .9 or 1.0 springs. If modded to tame the bottum and bring on the mid- top will be a screamer in buggy or truggy. The 3 port is an awesome mill it is alittle cheaper but still has plenty power and the delivery is smooth. Mine is modded and its just insane, but I drove a stock 1 and it was very powerful and had bottum end to spare. 1 thing I can say about any Go is they dont lack in power. I run my 3 port in buggy with 6.5mm restricter and carbon shoes with 1.0 springs and I use a 053 pipe. The 086 pipe will help out in the top end of the powerband. The 053 is for me its a midrange pipe and I think it suites the 3 port well also. I used both on it and the 053 is the better choice but dont forget my mill is modded. I had Mark at Powerhouse put a race port on it and his work is insane he has a sport mod a race port and a turbo mod which makes the crank look like a fan blade. My buddy has a 5 port with the fan blade and that thing is just sick.