2:1 Systems

This 2-into-1 exhaust system is designed for large displacement, high output engines. Similar to the Fat Cat system, but has increased capacity for larger engines. The Boarzilla is an excellent choice for engines with performance modifications and plus 25% or larger displacement. The muffler includes a 2-1/2” core perforated baffle. Includes full-length header heat shields to ensure great looks over the long haul. For the traditionalist, a non-functional “Ghost” pipe is available for the left side of touring models to keep the dual exhaust look. This insert raises low end torque while not sacrificing sound level.  It does drop the high end horsepower level slightly on big inch motors (on smaller engines it doesn't affect hp) and changes the tone of the muffler a bit making it sound more like a deeper version of a Rinehart or RC muffler. All Exhaust Systems listed on these pages are designed solely for Competition Race Use Only. Not designed or legal for use on a public highway.

Not legal for sale or use in California on any pollution controlled motor vehicle. Not legal for sale or use on any EPA pollution controlled motor vehicle.

The D&D Fat Cat 2-into-1 exhaust system is an excellent choice for engines with performance modifications from stock to plus-25% displacement, delivering a torque curve that is high and wide, with a strong top-end pull. Excellent workmanship inside and out; broad power design really shows up on the dyno. All 1995-2008 Touring model 2-into-1 Fat Cats are equipped with 18mm oxygen sensor bungs. This insert raises low end torque while not sacrificing sound level.  It does drop the high end horsepower level slightly on big inch motors (on smaller engines it doesn't affect hp) and changes the tone of the muffler a bit making it sound more like a deeper version of a Rinehart or RC muffler. All Exhaust Systems listed on these pages are designed solely for Competition Race Use Only. Not designed or legal for use on a public highway.

Not legal for sale or use in California on any pollution controlled motor vehicle. Not legal for sale or use on any EPA pollution controlled motor vehicle.

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