:OMG: I was just looking at those THS pipes and I don't think the performance gain (if any) will be significant enough to justify the cost. Keep the pipe you have and adjust it for the power band you want to perform best in. Adjust by lengthening or shortening the header or the distance the pipe is inserted into the coupling. Short pipe for low end power, long pipe for high end power. If you shorten, make sure the pipe and header do not touch or it will cause Radio glitching. You can cut about 1/4-1/2 inch off the header if you need to. If you want to extend the header farther than the coupling will allow you can get a second coupling and add a section of copper tubing with the same I/D as the header pipe. Don't forget to cut the body for the stinger when you move the pipe. :hammer: