Borla Wailtail Oval 2-1/4in x 5in Side Round Out Boomer MufflerBorla Wailtail Oval 2 1 4in x 5in Side Round Out Boomer Muffler Borla Boomers are full blown, high tech, dyno and race proven mufflers for the street or track. These eye popping, fully polished, T 304 stainless steel mufflers feature an integrated polished tip, and utilize Borla's patented race winning technology for improved exhaust flow. In addition to adding head turning sound, they also add a modest boost in horsepower. They utilize 100% welded