Just wanted to post, last year I ran my 07 xb12r w exhaust, custom tune, a/f and breather re rout and ran 12.01 at 116mph this year I did the gear reduction I put the xb9r primary gear and chain in my trans, and ran a 12.38 at 110 mph had too launch in 2nd gear and was hitting red line in 5th gear just as I crossed the 1/4 mile line, although my time was slower my 60ft, 330 and 1/8th mile times improved