How do I tell? I've heard mixed comments on the wheels (16 vs. 17). What other things can I look for?

I believe the sport package included 5 spoke 17" alloys, Underbody aerofarings, titanium inside trim on door grips and tranny shifter, and sport tuned springs and shocks, and rear trunk spoiler.

That's how they came here in Canada....not sure about south of the border.
C.

No spoiler on the 03.5 sport package in the states. Also included upgraded (high performance) tires.

The wheels are a way to tell, assuming they have not been switched. The sports package wheels are five spoke, the non-sport are six spoke. Also the sport package springs are red in color.

I think you mean the shocks are red in color. All springs are black regardless of what year or model I believe.

I own one, its got the 5 spoke 17's...as opposed to the 6 spoke 16's. It's got a tighter suspension (springs, sways,)...and the most important difference to me is the inside has got the silver/titanium trim.

If it's got that ugly titanium center console then it's got the sport package. Can you guess why I didn't get the sport package

hey hey hey, thats why i got thee sports package!

Yes, thanks for the correction.

03 Sedan Sport Tuned Suspension Package:

-Sport tuned springs and shock absorvers
-5 spoke 17-inch aluminum alloy wheels
-215/55R17 W-Rated summer performance tires
-Additional Titanium tinted interior trim
(Included with G35 sedan leather and 6MT Model)

Word to word, I have the brochure right here.

Only G35 with 16's are the one with cloth interior. 6 spoke is also 17's

Thanks for all the replies, I think I've got it now.