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These patented BBK Performance Varitune mufflers are the first of their kind in the aftermarket, fully adjustable performance Mufflers that can be adjusted for a louder or quieter sound and horsepower by simply moving the adjustment screw in or out from underneath the car with a wrench!These mufflers are manufactured with 439 stainless steel, in 2.5, 2.75 and 3.0 and with various offsets to fit most aftermarket and OEM applications.These are 2.75 in. offset/offset Mufflers that are designed to fit many car and truck applications including most Ford Mustang applications.
These patented BBK Performance Varitune mufflers are the first of their kind in the aftermarket, fully adjustable performance Mufflers that can be adjusted for a louder or quieter sound and horsepower by simply moving the adjustment screw in or out from underneath the car with a wrench! These mufflers are manufactured with 439 stainless steel, in 2.5, 2.75 and 3.0 and with various offsets to fit most aftermarket and OEM applications. These are 2.75" offset/offset Mufflers that are designed to fit many car and truck applications including most Ford Mustang applications.
Vari-Tune Adjustable Performance Muffler; 2.75 in. Inlet/Outlet; Offset/Offset; Rectangular Body; Tunable; Chambered; Stainless Steel;
UNIVERSAL 2-3/4 VARITUNE ADJUSTABLE MUFFLER DOUBLE OFFSET (439 STAINLESS).
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The maker's installation guide is on this page — see Installation guide under the part details for the step-by-step and the torque figures. Work on level ground with the car properly supported, and torque every fastener to the maker's figure. If the job is beyond your tools, any shop that does this kind of work can fit it.
The sound depends on the muffler and resonator design. A cat-back with a resonator stays closer to stock; an axle-back changes the tone more than the volume. Look for the maker's sound notes or a clip on this page.
Cat-back and axle-back systems bolt to the factory connection points. Headers and downpipes replace the factory pipe at the engine and may need new gaskets and hardware; see What's in the box.
A cat-back or axle-back needs no tune. Headers and downpipes change what the oxygen sensors see, so many cars need a tune or a sensor spacer to avoid a warning light.
Drone depends on the muffler and resonator design and your car's gearing. Systems with a resonator or an X-pipe drone less, and the maker notes when a system is built to be quiet at cruise.
An axle-back or cat-back is a jack-stands job with the right sockets and penetrating oil for rusty bolts. Headers and downpipes take more room and time, and a lift helps.
Most systems include the clamps and gaskets they need; see What's in the box. Reuse a factory gasket only if it is undamaged.
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