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 construction for strength. High - temperature continuous - filament fiber (CFF) acoustic material for sound control. Natural mill finish can be brushed or polished prior to installation. Available in a variety of universal - fit styles, Borla Boomers are made in the USA from aircraft - grade high - quality T - 304 austenitic stainless steel and include a Million - Mile Warranty.