In addition to working on a potent twin-turbocharger kit for the C8 Chevrolet Corvette, Hennessey has developed a stainless steel exhaust system for the sports car that not only makes it sound even better but also adds a decent amount of power.

As standard, the 6.2-liter naturally-aspirated V8 engine of the current Corvette Stingray delivers 495 hp and 470 lb-ft (637 Nm) of torque. When strapped onto Hennessey’s dyno, a recently-delivered C8 churned out an impressive 436.9 hp and 414 lb-ft (561 Nm) at the wheels. While those are very respectable figures, pretty much all OEM exhaust systems restrict airflow to some extent, leaving some horsepower and torque on the table.

Eager to find this untapped power, Hennessey has developed a full stainless steel system for the mid-engined sports car and when placed on the dyno with this exhaust, the C8 delivered 458 hp and 433.7 lb-ft (588 Nm) at the rear wheels.

“We designed a new stainless-steel exhaust system for the C8 that slightly increases power (20 hp), improves sound and is lighter by around 12 pounds,” company founder John Hennessey recently said. “We’ve been doing some validation testing and thought that a run over 200-mph would be the ultimate test of performance and durability for our new exhaust system. We also installed a Nitrous Oxide system to bump power to around 650 HP. We are very pleased with the results and we will be releasing our C8 exhaust upgrade in the very near future.”

Hennessey has not publicized a price for the stainless steel exhaust system but says there is a special pricing offer for the first 100 orders.