Scorpion Catback uitlaat Volkswagen Polo GTI AW bmw-4-series-gxx---19----440i---374-esi8560337 Do I need tuning for

Do I need tuning for this kit

they fit from the downpipes to both original and aftermarket catback systems

Why use silver spark plugs

Anthracite colour

Scorpion Catback uitlaat Volkswagen Polo GTI AW bmw-4-series-gxx---19----440i---374-esi8560337 Do I need tuning forThe Scorpion catback exhaust for the Volkswagen Polo GTI AW is made from T304 stainless steel. The system features mandrel bent pipework and is TIG welded for optimum performance. This exhaust fits from the catalytic converter onwards and is available with polished or black 90mm Daytona tailpipes. Features Direct bolt on 100% T304 stainless steel TIG welded 2. 75" 70mm tubing Daytona 90mm polished or black end caps Hardware included Instructions