I had one 2 years ago and didnt work for nothing at altitude The first bmp pipes you had to get the exhaust valve delete kit which will take away all your low end power ==couldnt even pull the dyno down low Had exactly 64hp at 5500 rpms The dyno guy said ''what you got from 1000rpms to 6800 rpms is a trail indy'' got the revised pipe that let you run the valves and worked bad also verry peaky on the dyno ==junked that and got the speedwerx pipe and all works great not one problem for 2 years sled works great 191 hp on dyno with pipe intake and rk tech head if youve had bad luck with speedwerx I would try a slp or a straightline pipe. Buy bmp =no run, call em,''you need our head'' dont work ''you need our intake'' dont work, you need our clutching'' dont work ==you must not know what your doing CLICK hang up just my 2 cents