Great information.
Looked at the Saleen chrome wheels from American Muscle. 5-spoke chrome rims. Exactly what I want. Look very clean and simple. $1,300 for all 4 with tires as well, not bad at all.
http://www.americanmuscle.com/chromesaleen-18x9-9904-sumitomo-stan.html
It says it will come with 275/35-18 tires. Wouldn't 275 be too wide for the Grand Prix. or have to roll the fenders? Not sure.[/QUOTE
Yeah the kit they have may only give you the 275's but you can actually build your own kit with them as well and it can actually be cheaper than the kits they have depending on if you don't go to crazy on what tires you choose. On my Mustang for my set up I used the cheap tires that one of the guys commented on earlier that he said they were crap (Sumitomos) Well I can tell you when you are able to buy a 315 tire for $165 and it has butt loads of grip Is one hell of a bargain However they do have one fault (30,000 mile tread life) and is completely depending on if you can keep the car from spinning the wheels too much but then again these things are so cheap you could stock pile them if you really want to make some smoke "They smoke really nice" but once these tires are warm they are nice and sticky, Just to show how well they hold I know a guy who had put the same tires on his 87' Fox drag car for street tires these were able to handle his car just fine and his was a fully built 408 Stroker (around 550whp). (245's will be your best fit this is what i was running on my front wheels and had plenty of clearance lock to lock with no rub). these are not like a touring tire they are a High Performance tire that can take anything a GP can throw at them especially a stock GP in fact I am going to be buying two more 245's and two more 17x9 FR500's as soon as I can to put on my GTP and they look awesome on the car (saying from my test fit) a little bit too much fender gap but I can roll with that for a while the struts need to be replaced anyway. if you want to take a look they are on my page to see what I mean.
Note:
My GTP 40th ann. 2dr with my FR500 wheels I just used the front wheels off of the Mustang and the fit was really nice. tires didn't stick out really at all but take in mind that the FR500's I used are only the 17"x9" which wheels and they made the car sit a little higher note the Fender gap will look like a 4x4 until you lower it. and 18's will be even worse. 275's will be a bit much but a 245/45/17 will sit right at the edge of the fender on the front and the rear will sit flush with the fender.
After my wheels and tires, lowering it and my SD Front Air Dam is installed I'll snap some pics to show you what it looks like. but so you don't have to go looking for it here is the pic I was talking about earlier