If you want to reveal the whole potential of the engine you can also install sports air filter along with performance exhaust system. (mywikimotors.com)
An aluminum housing holds the open sports air filter, and the filtered air tube is made of stainless steel. (ausmotive.com)
A new sports air filter and freer - flowing stainless - steel exhaust system also make up the engine - based modifications. (evo.co.uk)