They were probably just trying to sell to you. There is no "sport suspension" package on coupes in America.

Andrew

2003 coupe 6MT blue premium aero (since 3/9/03)

 

The GS-D's are high-performance summer tires. They'll stick to dry asphault quite well, wet stuff is marginal, white stuff is lousy. (Or so I'm told....) They're also reported to be a little rougher riding and noisier than some other tires choices.

2003.5 G35 Sedan Desert Platinum/Graphite Premium/Sport/Aero/Nav/Winter

 

So you think I should stick with these tires or should I go for 18's (if possible 18 that weight about the same as 17's) or wider 17's tires?