Just ask him how much extra weight he wants you to put in the car to even things up. Maybe suggest letting his girlfriend/wife/mother/sister, whatever female he holds dear in the car alluding to the fact that she's so fat it would more than cover any weight issue.
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1997 Mustang GT "The Freak" - 13.80 @ 101.70, 2.07 60'
1995 Honda VFR750 - not much @ really fast (actual data pending.)
1964.5 Mustang 289
Rice Haters Club Member #13