Hello and :th_sign-welcome1:
I know you said you read the Safely Modding thread but I have all 3 of our big ones bookmarks so I'ma make a quick link here for reference anyways.
http://www.grandprixforums.net/safely-modding-your-3800-a-67580.html
Safely Modding ^^^
http://www.grandprixforums.net/ultimate-cheap-mod-thread-free-50-a-49055.html
Cheap mods^^^
http://www.grandprixforums.net/97-03-w-body-buyers-guide-common-problems-60802.html
Pre-purchase look for these^^^
As to your primary query, if you are looking for a coupe you need to steer clear of 03s. I'd stay away anyways, they have alot of 03 specific parts that are NOT interchangable with 97-02 or 04+ cars. That and they are sedans only.
So narrow down to 97-02 for a coupe
Daytona editions were 98 & 2000, Special edition in 01, and 40th ann in 02.
97 & some 98s had a vacuum actuated tranny and weaker parts, so I would stick with 99-02 if you want to mod it to 300hp, it won't hold up much better, but every little bit helps, right?
If you have problems with losing keys regularly, I would suggest a 99, its the only year with the good tranny and NO PK3 option for security. 2000+ all use electonic (resistor) and if you lose one would require programming, plus the keys cost substantially more. One reason I love my 99. After all its a Grand Prix, if they want to steal it, its not that hard to bypass the PK3 setup.
go to
Pontiac Grand Prix - Wikipedia, the free encyclopedia.
It will give you some more indepth info on the differences through the years. For the most part, watch for rust on the suspension, wheel bearing, knocks, and weak tranny symptoms. If its good it should be solid.
Good luck