Yes.

 

• FE1 suspension – standard on LS, LT and LTZ models, it provides a smooth ride and includes a 19-mm front stabilizer bar and a 16-mm rear stabilizer bar .
• FE3 suspension – standard and available only on SS models, it delivers a firmer, more direct ride and includes 22-mm front and rear stabilizer bars, four-wheel disc brakes, monotube shocks and 17-inch wheels and performance tires.
• FE5 suspension – standard on the SS Supercharged, it was developed on the racetrack to deliver sports car levels of handling and grip; 24-mm front stabilizer bar and 22-mm rear stabilizer bar, higher-rate springs and bushings, four-wheel disc brakes, monotube shocks and 18-inch forged aluminum wheels with complementing performance tires.

 

i have a 2.4, and the progress rear bar was and is the best thing i have ever done to it.

 

Personally after you price out a set of new GM springs you'll probably be looking at a good after-market company instead. I'd recommend the Pro-lines from Eibach if your looking for a little drop and some stiffer spring rates. Lots of people blow the stock struts out by going to low though so be careful.

 

Naw, I was asking because I'm throwing Eibachs onto my SS 2.4, so I'd have extra FE3 springs left over...