BMW 340i 440i B58 Downpipe with 200 Cell Hi-Flow Sport Cat & Heat Shield

MTC Motorsport BMW B58 Stainless Steel Downpipe With Hi-Flow 200 Cell Sports Cat and Heat Shield

• The B58 downpipe is machined from T-304 high-grade stainless steel and are tig welded in house.
• This downpipe comes straight from the turbo providing a sharper throttle response due to a faster spool of the turbo.
• It will provide noticeable power gains and a much more aggressive exhaust note which sounds amazing.
• It produces lower temperatures and less exhaust backpressure due to the relief of the turbocharger. The cylinder charge is increased which gives you maximum performance.
• Finished in brushed stainless

These will fit the following models with B58 engine and pre OPF.

• BMW M140i
• BMW M240i
• BMW 340i
• BMW 440i
• BMW 540i
• BMW 740i

We have tested this product and found increases of around 20-25 bhp without tuning and 120bhp+ on a tuned car. Professional installation is recommended as some exhausts sit slightly different from others and can be tight.

Note: we cannot guarantee that this will pass an MOT test.