The Xcalibur pipe, its a stainless steel big bore stroker pipe! After removing my CT Racing pipe and installing my Xcalibur pipe I put a 165 main jet in my 35mm PWK carb. The 165 main jet was giving me a rich bog at wide open throttle with my CT pipe. So i decided it would be a safe start for my Xcalibur pipe. The sound of the Xcalibu pipe is similar to the CT pipe. With the CT pipe i had a dead spot off the bottom a little before the powerbad kicked in. With my Xcalibur pipe that dead spot is GONE! The Xcalibur pulled harder through the mid range and kept revving! I put a 168 main jet in. It kept revving!! I put a 170 main jet in. It kept revving!!! I put a 172 main jet in. It kept revving!!!! But i think i lost some mid range power with this jet in? I got a 175 and 178 on ebay, and should see them in 4 days.