Oval/twin pipes up to 2.5” x 10.5”. Patented suction cup attachment method included for use with flush mount tailpipes when used with a fan assisted system. Fits 3” and 4” hose. Our oval tailpipe adapters are designed for wide oval tailpipes or twin pipes and affixed to the vehicle with a chain and hook, friction fit, or suction cup for flush mount tailpipes. A ½” gap is recommended for proper air flow. They will withstand exhaust temps up to 600°F when used with a proper fan assisted system.