HKS Silent Hi-Power exhaust
HKS replaced their Hi-Power cat-back exhaust system with the Silent Hi-Power system. The new model should be a bit more quiet but the main advantage is that it's completely made out of SUS304 stainless steel whereas the Hi-Power had mild steel piping. The Silent Hi- Power is a 3" system and approved by the Japan Automotive Muffler Association (JASMA).
The HKS exhaust comes with gaskets and mounting hardware, a manual and a sticker
How to replace the exhaust
Modifications - Engine