Exterior huh? Let's see.
Custom built front clip elimintating flip up headlights probably w/ projector headlights mounted somewhere inconspicuous so I could have the wedge front end look even at night w/ CF hood (I like the contrast of the hood to paint)
CF wing like the one I have now (don't know who makes it or where it came from...long story)
CF chin spoiler but adjustable w/ turnbuckles like nascars
19" rims & mega fat rubber
Custom wide body kit that retains the stock lines but covers the afforementiond mega fat rubber, so the lines of the body look relatively stock but just really muscular and stout. Like a stock mkiii on steroids.
CF rear hatch
I hate to even give this one away but, I want a chrome rollbar that has two of the bars meeting and running down the middle of the car just below the rear window so they can be seen through the hatch glass. Probably not the best for rear visibility but I think it would look bad ass.
Oh yea and I love the 87 front bumper and facia and would keep that look but with an opening at the bottom for a monster huge IC.
Lastly, I'd have a custom painter do a skull and crossbones on the hood (see my avatar) that could only be seen from certain angles, kinda like one of those halogram baseball cards. You'd have to really look to see it or catch it from just the right angle.
In short I'd try not to do anything that wasn't one-off cause I don't want it to look like anybody elses car. Is that so wrong???