lol way to be a smart ass. If you read i said tech. Its a rule of thumb...just like every 100lbs is a tenth. I will say this much with 18's, 4.10s, lowered 2 and a 1/4 inches, and a midpipe my car went 13.97. Put drag radials on stock 17" rims and went 13.48. Put cams, plenum, t/b, with 15"...