that pipe runs well on several different engines and it's a soild performer...one of the wingnuts I run with has an RB S5...he bought last weekend and didnt tell anybody,he does run the motor/pipe combo from RB and let me tell you this...it was a screamer and it's ina Jammin X1-CR...a sorta heavy buggy but none of the less....it was fast...so fast it held it's own against some pretty powerful .21's.....If I wasnt running a CEO Modded P5,...I'd surely give this a second look.