this is nice tricked out kit built by mpi and kinda reworked by g-force in quebec. has blow off valve and also a valve to leak down boost for the days you might not have the proper fuel. only 800 miles in kit but for the northern riding we do seems to be hard to find premium fuel. with the leak down valve can be adjusted anywhere from 5 pounds up to 15. phone 306-698-2050 for info.