What size tires should I be buying?

[Steve]

18x9 Replica Saleen wheels. Tires I have now are not big enough, leave a huge gap in the wheel well. Looking for suggestions.

[ctrlraven]

Do you have an 03 or 04 and a hand held tuner?

[Steve]

Do you have an 03 or 04 and a hand held tuner?

03, and yes.

[ctrlraven]

255/45 all around will allow you to rotate tires

To retain the factory rake stance
255/45 front
265/50 rear

265/50 all around and can rotate.
275/40 all around but you might rub up front especially if it's lowered.

[Vortech347]

With 18x9's I would run a 255/45/18, 265/50/18 Nitto combo. That would look awesome and the 9" wheel will match the tread width well.