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BMW B58 4.5″ Heat Shield Decat Downpipe M140 M240i 340i 440i
BMW B58 4.5″ Heat Shield Decat Downpipe M140 M240i 340i 440i - view 2
BMW B58 4.5″ Heat Shield Decat Downpipe M140 M240i 340i 440i - view 3
BMW B58 4.5″ Heat Shield Decat Downpipe M140 M240i 340i 440i - view 4
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BMW B58 4.5″ Heat Shield Decat Downpipe M140 M240i 340i 440i

Original price was: £380.00.Current price is: £350.00.

  1. Order withinBefore 10am
  2. ShipsSame day
  3. DeliveredNext working day

Order before 10am Monday to Friday for same-day dispatch and next working day UK delivery.

This 4.5″ downpipe is the best value modification available. By eliminating the restrictive catalytic converter in the factory downpipe, back pressure is reduced significantly which results in a faster spool, an increase in power & a more aggressive exhaust note.

Off-road / motorsport use only. This part removes or alters emissions-control equipment. It is not legal for use on public roads in the UK and a vehicle fitted with it will fail its MOT. Sold strictly for off-road and competition use.

Fitting available at SD Performance

Want your parts fitted? Our Ilford workshop at 96 Goodmayes Road can fit everything in your order. Choose free collection at checkout, then call 020 8194 6688 or WhatsApp 07494 916329 to book a fitting slot.

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  • Heat Shield To keep Heat away from the Intake Bringing IAT Low
  • Made from handcrafted, TIG welded 4.5″ 304-grade stainless steel.
  • Smooth radius bends to decrease turbulence and increase flow.
  • Fits the stock catback as well as all aftermarket cutbacks that mate up with the OEM downpipe.
  • CNC SS304 Stainless Steel Flange.
  • Gains from 25-30hp with the tune.

Will fit the following:

  • 2016+ F20 F21 BMW M140i & M140i xDrive
  • 2016+ F22 BMW M240i & M240i xDrive
  • 2016+ F30/F31 BMW 340i & 340i xDrive
  • 2016+ F32/F33/F36 BMW 440i & 440i xDrive
  • 2016+ G30 BMW 540i & 540i xDrive
  • 2016+ G11/G12 BMW 740i & 740i xDrive

Delivery & returns

  • Free UK delivery on every order.
  • Free collection from our workshop at 96 Goodmayes Road, Ilford, IG3 9UZ. Fitting is available, just ask.
  • 14 days to change your mind from the day your order arrives.
  • Faulty or wrong item? We will put it right under the Consumer Rights Act.

Read our Returns & Refunds policy or call 020 8194 6688.

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