Banks Power 07-11 Jeep 3.8L Wrangler Unlimited - 4dr Monster Exh Sys - SS Single Exh w/ Chrome Tiprich, authoritative sound. Constructed of heavy gauge stainless steel, Banks Monster features a supersized, 2. 5 inch tailpipe with a stainless tailpipe tip polished to a mirror finish or choose the new Black tip! Monster Muffler, Banks straight through performance muffler, is the industry's least restrictive, more than doubling the stock flow. Monster virtually eliminates backpressure from the catalytic converter back, for more power and efficiency