Well there is a way to come out past the rear bumper and still look good. I did it, lol. As seen in the post below, they are tips that came off of Driverjohn'* SSEi.
I know they are not an 87-91 feature, but they do suit the style.
There is a couple of quick vids too, and NO they are not WOT, cause 1 Renée is driving and 2 it sounds best when taking of at a normal speed, peeking for sound at around 2k rpm.
and if you are too lazy to click on the link , here it is.