BETHEVIPER said:aftermarket pipes wont run pilots that lean. my slp ran 47.5 and better on 50. my sled with srx pipes even with the viper box ran 40pilots when i switch to the srx box sled runs and idles the same with the 40 pilots. im sure it is pipe design. as for mains the timing is the problem, with the srx box i can run 152, with viper box have to run 165 to be safe. this is with the srx pipes. the box makes this much differecne