Banks Engineering says its Stinger Plus system for the Dodge 24-valve turbodiesel provides an additional 87 hp at 2,200 rpm and boosts torque 269 lb-ft at 1,600 rpm. The Stinger is said to be good for an extra 61 hp and 187 lb-ft of torque. According to the company, these systems also manage engine airflow to optimize fuel economy, maintain safe exhaust-gas temperatures and preserve engine durability. Gale Banks Engineering, Dept. TL, 546 Duggan Avenue, Azuza, California 91702; (626) 969-9600; www.bankspower.com.