hey guys my brother wants to know what gm cars in pontiac uses or used a turbo from 1990 to 2004?

Grand Prix was the only one that I know. Just a couple years in the early 90'*.

we had a sunbird convertable 2.0 turbo back in the day, but that might have been older than 1990??!!

The only models I can think of is the Buick Grand National and Regal but they stopped production in 1987. And as willwern stated the Grand Prix Turbo in 89 and 90 with a 3.1L pushing 205HP and a managed 225lb-ft torque. Here seems to be a pretty good web site on the Grand Prix Turbo http://home.att.net/~aldridgec/. I think the car companies mostly found out they could get more power and less stress out of a bigger engine than trying to beef up the small one. Like the turbo 3.1L only pushed 205HP which is very repectable it predicessor the 3.4L pushed close to 210HP without the stress of the turbo. Another good example is the new GXP they are putting the V8 that is going to push close to 300HP and it is not going to have the stress of trying to really beef up the V6 to get close to that.

1990 was the last year of the 2.0 turbo sunbird, i think

Pontiac also used the 3.8 turbo in an anniversary edition of the Firebird. Was it the 20th Anniversary edition?

I'd say do a search engine on the net like yahoo or whatever.

ummmmmmmm also in the 92 SSE :P

i don't believe it til i see it

Yes, I just looked. The 1989 20th Anniversary Firebird used a Turbo 3.8L engine.