i would put tha clutch kit in. if u put the performance kit in u will still lose power until you put a clutch kit in.
I would get the performance kit for this reason. If you were gonna run 28" I would say get the cluth kit, but with 27" they don't rob nearly as much power. I would recommend going with a lighter tire than the outlaws though, IMO they are heavy for what you get. I have Mud Lites and part of the reason I got them was because of the weight difference. I did not have a noticable loss because of the weight I think.The performance kit will help you all around. the clutch kit only helps get the tires turning from a stop..