4.5″ Exhaust Decat Downpipe – BMW 4 Series F32 / F33 / F36 440i B58 16-19

Manufactured from highest quality T304 grade stainless steel Mandrel bent and fully TIG welded for strength and durability Free flowing catalyst replacement to get the most from the B58 engine Designed to improve power and torque across the entire RPM range 4.5" bore to maximise exhaust flow     4.5" Exhaust Decat Downpipe compatible with BMW 4 Series F32 F36 440i B58 16-19, replaces the restrictive catalyst with a free flowing pipe, improving power and torque across the RPM range. Our 4.5" Exhaust Decat Downpipe is a great cost-effective way of releasing more power from your 440i.