I fitted a set of swarbrick cans to my MC18R5K. Back to back againest the stock cans they made the same peak power but increased peak torque and added about 2bhp to around 8,000rpm - 10,000rpm. The only real bad thing was I lost about 500rpm of over rev which I couldnt seem to get back no matter what jetting i tryed. Ive got full use of our dyno but still couldnt get it back. Ive gone for a full tyga set up now and hope to have them for next week.