I cant remember if those two pipes have been on dyno reports together but im sure they have been on here at different times, you should search it and see the gains for each. I personally have the HMF full system and love it, jetted with jd. Turns out good power, plenty for me for the time being. Good luck with your decision. Ultimately the different from pipe to pipe in really hard to feel IMO. But....Im also a beginner so Im sure there will be some great info from other members.