4-TRACK S 350, the newest addition to Hp Corse exhaust systems lineup, comes from the experience gained over many years of road and off road testing. This fully integrated, tried and tested solution has been designed to offer the most demanding riders an efficient and extremely reliable product, street legal and fully compliant with current legislation. 4-TRACK S 350 retains just the outer sleeve shape of its predecessor "R" – redesigned internal components, and a wider 62 mm exit nozzle with a 40 mm reduction are just some of the elements that characterize the proof of HP CORSE’s continuous search for new solutions. The muffler outer sleeve has an octagonal section, available in stainless satin or black ceramic finishing. The exhaust is equipped with a carbon fiber heat shield featuring an HP CORSE resin coated sticker. Laser engraved logo on the outer muffler sleeve and type approval number on the inner side complete the product.