Haha, the middle of the racer crowd and the lawyer crowd is a fine line to walk!
To me, it still says Fast & Furious. I think you're going to turn off the lawyer crowd. The downside is if you migrate in the corporate direction you're going to alienate the racer crowd which I assume is your core client base now.
If I were in your shoes (and I have been, sort of) I would start with the logo. The logo is the foundation of any wrap design. If you have a racerish logo, it's not going to look good on an ultra conservative corporate wrap. And vice versa. Try redesigning the logo so it has appeal to the business folks but doesn't necessarily lose appeal to the racers. It may be a bit tricky but it's doable.
I'm not knocking your current logo when I say this, but I don't really see a way to design a wrap around it that is appealing to the business masses. The racer crowd is simple (no offense intended), if they see a wrap that is even remotely well done and colorful, they will be excited. If you do good work and can wrap something, they will seek you out and they won't be overly turned off if your image leans slightly to the corporate side of things. BUT, the opposite typically holds true for the corporate crowd. They are easily turned off by the aggressive, racer, F&F type look, it's just really really hard to brand yourself like that and still look professional (to them).
Look up GraphixEmporium on here. I've always thought he did a great job on his brand. It walks the line between custom and corporate really well and I think it would be extremely appealing to both ends of the market. Study a few companies like that that are successful and figure out what subtle things they've done in their image to make themselves appealing in both directions. It's all a compromise, you just have to figure out where to give and where to take.