Trade my 08 cobb 135 for 08 x5 4.8?

[harleybones33]

I just bought my cpo 1er and put in 1700 for short shifter, Cobb tune, CDv delete and clutchstop. It friggin flies. I live in Boston area where the roads suck moosec*^#. I have another 6 days to trade it in for full value and was thinking of getting a cpo 4.8 black/ black. Missing my suv as I\'m coming out of an 06 RR SC. Wish I could have both but I\'m a chiropractor not a plastic surgeon . Im a beemerphile at heart so feedback would be appreciated. Thank you in advance.