NOOOOOOO! I have a pro in the town next to me. Rebuilt turbos in the navy, has the biggest auto repair/tow truck opperation in the area. Says he has been a TURBO NUT since the age of 16. I have a 2 1/4 exhaust cat back, no muffler. Will that cut back on the lag some if I just go with the VJ 11? I hear you can boost 18 lbs with a good one! What do you think. Rocky