Well, here's my 2.5" chrome slant tips out the GT valance. Unfortunately...you can't really see em all that well unless you're up close. I'll try to take a closer pic tomorrow, it's kinda late now. I keep em nice and polished, but it doesn't even seem to matter. If I did it over, I woulda had em stick out the rear about an inch more.
I was thinkin stickin out further so you could actually see em...they're pretty hidden back there. A tip with a "thicker lip" would prolly do the same job, or maybe a straight cut.