that dirt wheels exhaust shootout was very informative. It said the ct pipe was 8lbs and stock is 11lbs. It was one of the heavier kits but it was one of the most quiet and had one of the highest hp gains, i believe the pro circuit was also high in hp and lighter. The yosh was the lightest at 4lbs but not as much hp,it all depends on what you want.The ct comes with jets

 

I've been having the same problem with hitting the rev limiter after I replaced the pipe and did the jetting and airbox mods. People have suggested that I replace the intake cam with a HotCam and add a Vortex ignition. It's nothing I could dial in myself so I'm having my mechanic do the work. He says it's a pretty simple upgrade. Only will take a few hours to install and costs like $500-600 total for parts and labor. I may need valve springs also but he's going to be in there anyways so it's not much more to deal with.

 

I also easily hit the rev limiter now. Just have to shift faster.

 

The problem I had is when I hit mud, water or something slippery the tires spin and it revs out before I can get to the shifter. Especially on an steeper, more technical incline.