I am trying to sell my OEM springs off of my 2003 coupe, just wondering if there was an option of sport tuned suspension for the 2003 coupes or if they all had the same springs.... thanks a lot for any info.

 

Sport tuned is how Infiniti defined the coupe suspension, all 03/04 car's have just one suspension regardless of transmission or option level's. In fact any production coupe delivered with oem 17 and 18 inch wheels regardless of build year has the same regular suspension. This is NOT to be confused with a 05/06 car that has a sport suspension as defined by having been delivered with oem 19" tires and wheels. A 05/06 coupe delivered on oem 17 or 18" wheels of course does not have the sport suspension, but the same regular suspension as all 03/04 car do.

Regular coupe suspension: 314/342 spring rates (any 03-06 car delivered on oem 17" or 18" wheels)

Sport suspension: 314/427 spring rates, stiffer shocks, and stiffer front sway bar. (any 05/06 car delivered on oem 19" wheels)

 

Not to be confused with the 18" wheel option in 03/04 which included LSD (but standard suspension).
The 18" wheel option for 05/06 is only that, wheels and tires.
LSD became part of the Sport Tuned Suspension package for 05/06

 

I thought about including the VLSD in the discussion, but it's not a suspension item and I didn't want to confuse anyone with how Infiniti changed things concerning the part in 05. Not to mention that it's not very good as a slip limited device performance wise anyway's.

 

I agree, I only mentioned it to help distinguish what comes with what packages for different years, since we have a 'mixed' group here.