This system has a 120mm tip & 65mm pipe. Inspired by & designed from the N-1 Endurance Race series in Japan, HKS has developed its Hiper Exhaust systems for both turbocharged & normally-aspirated vehicle applications. Each Hiper system is constructed using an unchambered (SUS 304) stainless steel muffler assembly, high-quality computerized welds, & large diameter ceramic-coated steel piping. Unlike the straight-back design of the Drager systems, Hiper mufflers & tips feature a unique offset flow & mounting design.