Well Now, My head is fully built.. A crower built head, Crower says my head is safe to rev to 10500 but i won lol... i am however goin to rev to 9500, i was reving at 9000-9200 but now that i got the valves from crower i might as well hear my 4 rats run their legs off.. .. Its coming along still looking for headers so i can get these bent up ones off and get my exhust done, still running stock Cat and Piping... on this gsr..