VEHICLE HIGHLIGHTS, This coupe cousin to the Impala sedan adds a supercharged performance model for 2004. Monte Carlo comes in LS, SS, and new Supercharged SS trim. The LS has a 3.4-liter V6. The SS uses a 3.8 V6 and firmer suspension. The Supercharged SS has a supercharged 3.8, stiffer-yet suspension tuning, 17-inch wheels vs. the other models' 16s, and special trim. All Monte Carlos have front bucket seats, 4-speed automatic transmission, and 4-wheel disc brakes. ABS, traction control, and a tire-inflation monitor are standard on both SS models and are grouped as an option for the LS. A driver-protecting side airbag is optional on all models, but a side airbag for the passenger is not available. OnStar assistance and satellite radio are optional across the line.