Supertrapp 828-71134 FatShots Slip-On Exhaust FatShots are the most versatile, tunable, disc-based exhaust. All of SuperTrapp&#39;s FatShots systems utilize their patented Tunable Disc Technology. FatShots are SAE-J2825 sound compliant. Easy to install! They include detailed instructions and all necessary mounting hardware.FatShots 4" diameter adds a massive look.The 3.5" chrome-plated body flares out to a 4" slash cut end which is capped off with SuperTrapp&#39;s legendary 4" discs and CAT-equipped headpipe.