The thicker font is just awesome! It looks very aggressive. It reminds me of the expression the frontend e30's have.
I agree with Grippy on the script. I like it! What text script are you using? Is this something standard in MS Word, or are you using some other sort of graphic arts program?
I'd like to play around and make a design. I actually like one person's suggestion of using the colored script like at the top of this forum page. I think a little picture of a 318is would be cool too... Somone on this forum (maybe it's another) has a side view simple line drawing (looks almost like CAD) of a 318is. That would be cool on the top, with the site logo/script on the bottom. 3 color, black, grey and blue shouldn't be too spendy.
I agree with SteetSpec_iS... our club forum colored script looks great! Of course, we would have to take out the roundel.

Maybe someone here can put a "demo design" idea like this together? Anyone, anyone... Buhueler, Buehler...
I think this layout in a 3-color inside glass decal would be great. rectangle decal would probably be best. Sorry to the guys with tint, but outside decals get faded, dirty, scrape off, etc. For this reason I strongly suggest an inside window decal. Sorry, but just one of the (many) unfortunate problems with window tint.