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Driven Racing Oil’s GP-1 8OW-90 Gear Oil
GP-1 Conventional 80W-90 GL-5 Gear Oil is a conventional limited-slip gear oil for use as recommended by high performance gear and differential manufacturers. Designed for racing and high-performance differentials and transaxles, it’s formulated from USA made Pennsylvania Grade base oils that provide natural film strength, tack, and tenacious cling without relying on polymers that shear causing viscosity loss.

A Bit of History
Hundreds of thousands of these “little” big-blocks were sold in the 1960s. In 1965-66 alone, over 150,000 came in the Impala, Biscayne and Bel Air big cars. Few paid attention to them because the hot engine of the day was the L-78 with high-rpm, rectangle-port heads. But when stock eliminator drag racers began flogging the L-35, it responded magnificently.

Meet the Best New Product Award Winners – Goodguys Columbus 2025
From suspension breakthroughs to slick bolt-ons and next-gen wiring solutions, this curated collection of fresh hardware gave attendees a first look at what’s about to hit the streets—and the shelves. With awards on the line and plenty of eyeballs walking the floor, companies brought their A-game, packing the display cases with smart engineering, clean design, and purpose-built upgrades. Whether you’re a pro builder or garage warrior, this was the place to get hands-on with the future of hot rodding.
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MORE POWER? BETTER SOUND? OF CORSA!
Installing Corsa RSC Mufflers and an X-Pipe on an ’05 Mustang
Author
Will Smith
Story & Photography
The Zing Factor in the Exhaust Market
In order to thrive in the exhaust market, a company must have products with a zing factor. For Corsa, the difference begins with its materials, production techniques, and efficiency of its designs. Corsa uses T-304 stainless steel, which makes each exhaust system effective, durable, attractive, and easy to clean. A good grade of stainless steel makes the process of cleaning pipes about as easy as scrubbing with a Scotch-Brite pad.
Reflective Sound Cancellation Technology
However, other companies also offer T-304 stainless construction, so what really sets Corsa exhausts apart? The answer is Reflective Sound Cancellation technology, a unique approach to muffler design that eliminates fiberglass insulation and other older technologies in favor of a targeted sound-reduction approach. Every vehicle has a speed at which the exhaust drones, which causes an unpleasant moment when the sound waves just seem to hang. You may have noticed this droning in your own car, and after a while, it can really become obnoxious. Corsa tests every vehicle to determine the exact frequency that this droning produces, and then mufflers are designed to create a sound wave that is 180 degrees out of phase with the drone. This process eliminates the droning noise entirely while leaving the rest of the exhaust note intact. The result is a remarkably crisp, clean engine note that brings out the intended sound of the exhaust. To generate this canceling sound wave, each muffler features a carefully sized canister and internal walls that reflect sound rather than damp it.
Enhancing Mustang Exhaust Systems
Unlike those on earlier Mustangs, Ford actually did a decent job with the exhaust systems on the S917 platform. The piping is crafted from stainless steel, and at 2-1/2 inches in diameter, it flows very well, which is good news because it eliminates the need for a traditional after-cat system. Instead, Corsa makes it possible to achieve impressive performance gains with an axle-back system consisting only of new mufflers. Corsa claims gains of 13 hp and 9 lb-ft of torque at the wheels, making this upgrade a high-horsepower-per-dollar investment. But if you want to take your exhaust even further, Corsa also offers an X-pipe that replaces the factory H-pipe. It offers better sound and performance, and it shaves 2 pounds of weight from the exhaust. We understand that weight saving may not be your primary reason for buying this system, but it is a nice bonus.
Installation at Dream Car Factory
During our visit to the Dream Car Factory (800/977-9894) in Streetsboro, Ohio, the crew was fitting one of its DCF500GT Mustangs with the Corsa system. The DCF installs Corsa exhaust on each 500GT it builds because the system’s improved sound, looks, and performance complement this limited-edition Mustang. Your Mustang will benefit from the system, too, and the installation will take no more than a few hours. The only special tool you’ll need is a pipe cutter, and when you’re finished you’ll appreciate your Mustang in a completely new way.
ARTICLE SOURCES
Manufacturer
Corsa Performance
140 Blaze Industrial Parkway
Berea, OH 44017
(800) 486-0999









