:lol: Yeah, 1543 was safe until I got stupid in a race and over reved it and stayed in the rev limiter to long. Broken pistons and twisted rods was the result. Now she is sporting an 03 cobra block,crank, rods and 20 over 18cc dd pistons,rev limiter moved up to 6500. Going with more boost when i get smaller pulley from K-B. Right now with the 10psi pulley on she is making just over 400rwhp and 405tq.cant get more because of pulley and needs bigger fuelpump. So yes as long as you dont get stupid you can be safe.