I agree with everything said...but, just in case you ever change your mind. I have ran the code 3 pulley now without any problems for over 10K miles...and it was an improvement. I do race mine from time to time, so it isn't for everybody, but first test run was 0-160 in less than a mile...now with a tune, I haven't tried that again, but I am sure we will top the 160...have fun, give Rob a call, he has the duals prolly ready by now...