I originally tried the 5-port in my buggy and found it to have too much bottom end for the short coarse tracks that i ran on locally. So I purchased the 3-port and it felt right at home. I then tranfered the 5-port over to the truggy and OMG!!!! The first race with it in my 8T made was unreal. I blew away the field and had numerous people after the race hunting me down to find out what was under the hood. The 5-port remained in th truggy up till last year then I transplanted a GO .25 in and it's been there every since. I did however have all three modded and yes it did have an effect on th run time and performance but on a local club scale it's really not required. I plan on running the 3,5 & 7 on a stock basis unless my sponsor gives me the Ok......hint hint.... That's why I'm truly looking forward to these dyno readings. I do believe th new GX line is going to be capable of hanging with most all high end motors out there. Kendall is doing a great job with his and I do believe his are all stock. With all good things out there, there's always room for improvements.