MongooseGA said:
what are the normal retail values on a TT C4 in good condition?
I guess it depends on who you ask. Also, it depends on the value you put on the Aerobody.
A non-aero 1990 with under 10k miles, to me would be worth about $25-27k depending on how mint and color and options and such. I've heard of a few 1988-89's with ~3,000 miles selling for $30k. That one I went and looked at, I'd say if it were in good shape for 30k miles, with the Callaway upgrades it had (about $4,500 worth) would be worth about $24-25k. But it wasn't in good shape, so the value depends on what you find ok. I'd want to make it mint again, so to me it wouldn't be worth nearly that much.
Aerobody cars, it's hard to say. Also, many have custom paint and such. You could option a lot from Callaway, and the aero cars had stickers that could be north of $90k (and this was in 1989-91, so fairly expensive). Once you've committed to $90k, some other optioning might not seem so bad. Callaway even had a full leather interior (full, like dash, doors, etc). I'd say a non optioned 1990 B2k aerobody with ~10k miles would be worth about $35k. A 1991, especially with 3k miles or less, might be $45k or more. It kinda depends.
I personally like that 1990 had the new interior, but still had the roof mounted rear brake light. 1991 was the new, more rounded ZR-1 inspired C4 body (doesn't matter for aero since it's all lower-body except for the brake light), and the 3 non-aero B2K's that were made in 1991 (almost all cars that year were aeros) look kinda interesting/weird with the hood scoops but the new body style. But 1991 had a new intake and the hood scoops that increased power a lot (both could be added to 1988-90 cars, and to some extent to 1987 cars).
1988-89 cars, imo, are similar to 1990 values, maybe a tad less for the same miles/options, etc. But in 1990, the car had a huge interior change, went to speed density vs. MAF, and had some cooling and other changes prompted by the ZR-1. So it depends on which interior you like to decide which is more valuable.
1987 cars had a totally different turbo setup and were rated at 345 hp/465 lb-ft. 1988 went to Rotomaster turbos vs. the IHI's, and power jumped to 382hp/562 lb-ft. So the 1987's don't carry quite as much buck, but are pretty cool cars. They are the ones with those NACA ducts in the hood. You either love those or hate them. I don't love them. (1990 power was 390hp/570lb-ft, 1991 403hp/575lb-ft with a 450hp option on speedsters)
Sorry if that's longer than what you wanted, and of course it's all just my opinion. Asking prices are a lot higher, but I've seen cars that have been for sale for a year or more. You can ask whatever price you want, but not if you want someone to buy what you are selling.
Edit: Speedsters have gone for $150,000 or more. One recently pulled $150,000 at the Carlisle auction, but didn't meet reserve. The LT-5 twin-turbo powered Super Speedsters can go for a 1/4 mil.
Also, I think personally that originality helps. Some stuff, no biggie, like exhaust. But stuff you can't easily change back. Dymags help too. 1987's they were an option, but I think by 1988 Dymag magnesium wheels were standard. They are expensive to replace. There's a nice "500 series" Callaway Twin Turbo convertible in PA for sale for asking $45k. It pulled $40k at auction, but didn't meet reserve. I believe the dealer's had it for at least a year. It has some hideous 3-spoke wheels that look like they came from a deli slicer. I think if it had Dymags, it would have sold by now.
I also think there's kinda something cool about a car with just all the Chevy options, including B2K. Then it's like the ultimate factory car, without any of the non-factory stuff like the aerobody. Kind neat, but then the aerobody is pretty dang sweet looking.
