Weight, sound, HP gain ?
IMHO get the 4 in 1 full system. It gives you the greatest advantage in weight, ponies, and sound.
You can get some very good info here by using the search feature. One of our sponsors has performed numerous dyno pulls on various systems.
Get the full system! Lighter, more power, and sounds smooth and sweet!
You'll get a little power boost, better looks, a little less weight and better sound. If you're happy with the power now and just want to add some looks and noise they'll be fine. But like the guys are saying. if you want a big power gain the full system is the ticket. I'm running a yosh full system, big power gains above 5 grand, a ton less weight, bike feels wayyy lighter, and has a nice sound without being obnoxious on longer rides. Plus it looks hella goodany advantage with r-77 carbon slp-on over stock
Sounds like sport bike riders more experienced than me (Have rode harleys for 26 years) think Yoshimura 4-2-1 system is the best. Thanks for the advice.
Bill