Borla Boomer Blow Torch Muffler Oval 2-1/4in x 4in Side Round OutBorla Boomers are full blown, high tech, dyno and race proven mufflers for the street or track. These eye popping, fully polished mufflers utilize Borla's patented race winning technology. In addition to adding head turning sound, they also add a modest boost in horsepower. Available in a variety of universal fit styles, Borla Boomers are made of aircraft quality high quality T 304 stainless steel and include a Million Mile Warranty.