If you can, get old original Ford gears, as long as they aren't worn, those are the quietest. Loud rear axle gears sound like a jet taking off. Some aftermarket gears are noisier than others. Yes, the nodular iron case is better than the grey iron case. I've purchased but haven't installed yet a Gear Vendors Overdrive that bolts to the back of the transmission and provides a 0.78:1 overdrive gear that drops down the engine RPMs. I've modified my car with a C6 transmission out of a '66 428 donor car. Red line is about 5500RPM, and if you dropped to 2nd gear in a kickdown you'd be at 5200RPM 75MPH Switching to 3.73:1 gives 3087 in 3rd gear, so almost exactly 600 more RPM If you go up to 75MPH it is at 3562 RPM, which is really screaming for a bone stock 390. With 3.00:1 rear, this converts to an engine RPM of 2483 in 3rd gear 65 MPH The manufacturer (Firestone) says this tire turns 764 times per mile. View some examples for yourself at and find out why “BORLA® Exhaust” has become one of the web’s most popular automotive search terms.I have a radial tire that has about the stock tire diameter: 27.3 inches. ![]() With our patented XR-1® technology present in our ATAK®, S-Type, and Touring systems, customers can pick the sound level desired with the confidence that their aftermarket exhaust system will increase power to the greatest degree. Each aftermarket exhaust comes with the maximum horsepower and torque available throughout the entire RPM range. Superior Performance Exhaust Soundīorla offers performance exhaust systems with a variety of sound levels to ensure your experience fits your specific needs. Whether it’s a performance exhaust system for a Corvette, Mustang, Camaro, Porsche, BMW, Volkswagen, Audi, Jeep, F-150, Silverado, RAM, Subaru, Mini Cooper, Challenger, Charger, Scion, Toyota, Kia, Infiniti, Nissan, Honda, other application we offer, you can be sure the muffler technology has been catered to the year, make and model of your specific vehicle. Our patented and race bred muffler technology consistently provides the finest sound enhancements and performance exhaust system capabilities because every system incorporates performance mufflers designed specifically for each application. Exhaust Manufacturer Who Delivers the Perfect Product We will support you well beyond the day you purchase a Borla performance exhaust system. Our million-mile warranty, which is the most comprehensive of any exhaust supplier, means Borla will stand behind your performance exhaust product longer than you will be driving your car and that’s a commitment you can depend on. Million Mile Warranty for Exhaust Systems, Mufflers & Headers ![]() Borla Performance remains the world’s leader in upgrades for performance exhaust systems. For more than three decades, hundreds of other exhaust suppliers have attempted to copy our winning formula, but haven’t come close. Leader in Performance Exhaust Systems & InductionĪs the originator of aftermarket performance exhaust systems, Borla Performance products are unique in three ways: They are made from exotic materials, such as stainless steel, titanium and carbon fiber they come with a warranty that outlasts a vehicle’s life and their muffler design allows for a bolt-on and easy fit.
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