i ran an evo 8 fq 300 for two years and 32,000 miles with no problems at all! not as modified as yours tho, it had a 3" system,uprated pump, w,r,c remap h,k,s blow off and mushroom filter! reguraly seen wrong side of 170, (on the clocks anyway) without as much as a squeak! p,s,,,, car had also done 22,000 miles when i bought it! gutted for ya tho matey