Milltek Volkswagen Golf MK7 GTi (including GTi Performance Pack‚ Clubsport & Clubsport S models) 2013-2016 Cat-back Exhaust - US Version - Matt Black Tips Radium Fuel Rail Mazda 1.6L B6 After some experimentation

After some experimentation

See the graph below

Forged billet aluminum compressor wheel

Mil-spec hard anodized valve guide and stem

but for the two lower pieces there is an option: Standard or SportDesign

Milltek Volkswagen Golf MK7 GTi (including GTi Performance Pack‚ Clubsport & Clubsport S models) 2013-2016 Cat-back Exhaust - US Version - Matt Black Tips Radium Fuel Rail Mazda 1.6L B6 After some experimentationAll Milltek performance exhaust systems are manufactured from T304L stainless steel; giving you the satisfaction of knowing that our products are meant to last within some of the toughest environments. T304L is a highly durable form of stainless steel that is far less susceptible to degradation and discolouration than many others of its kind, while it will last almost indefinitely.