The HKS Hi-Power range of exhaust consists of different exhaust systems that all offer their own benefits depending on your needs. This range of high-performance exhaust systems has been carefully designed to improve flow rate and reduce back pressure whilst retaining road legal noise levels and maximizing high-end power gains.304 stainless steelIncreased engine performanceSignificant weight reductionSilent Hi-Power exhausts offer high performance and a sporty appearance with the added benefit of reduced noise levels, these systems are made of T304 grade stainless steel for high lustre and long-lasting performance. They also introduced the silent chamber on specific models which removes a lot of the lower-frequency noise.Hi-Power 409 exhausts are a cost-effective option, The rear section is made from SUS304 grade stainless steel while the non-visible piping section is made from coated T409 which is more resistant to thermal expansion and has improved acoustic properties. This allows Hi