T4 Twin Scroll Manifold & 3″ exhaust for BW EFR 6258/6758/7163 Turbo with Twin/DUPLEX Muffler

Description

This kit includes the twin scroll turbo manifold, 3″ downpipe and full 3″ twin exit exhaust.

Twin Scroll Turbo Manifold

Cast from NiResist D5S Type 2, a high-nickel austenitic cast iron that resists cracking under sustained heat and repeated thermal cycling far better than stainless fabrications or standard cast iron. This is not cheap material and it is not easy to cast, which is why these manifolds come with a 5 year unlimited warranty.

Runners are paired 1-4 / 2-3 to keep exhaust pulses separated between the two scrolls. This preserves pulse energy at the turbine wheel, improving spool and response right through the rev range. With 38mm ID runners, this manifold flows enough to support 600hp+. Internally gated through the EFR’s built-in wastegate, so no external gate to package. Fits with AC in place.

3″ Downpipe

3″ V-band connection to the turbo with a tight radius bend to clear the chassis. Made from 304L stainless steel elbows and pipe, TIG welded throughout. The tight radius bend is made from pie cuts and back purged. Space is limited and the downpipe sits close to the brake lines. You will need to bend/wrap the brake lines. This is the same for most turbo systems and doesn’t create any issues.

3″ Twin Exit Exhaust

Hand-made, straight-through design using 304L stainless steel throughout, TIG welded with V-band connections all the way. Twin exit out the rear. The duplex muffler, resonator and 200 cell metallic cat are made in Sweden by Simons Exhaust Systems.

Simons part numbers:

• Twin Exit Duplex Muffler: U327663R
• Resonator: U457600R
• 200 Cell Metallic CAT: UK0376AR (optional)

The exhaust does not come with a cat as standard. You have the option to order a cat and decat pipe with the exhaust, otherwise it ships as decat with a straight pipe where the cat would sit. To add a cat afterwards the exhaust will need to be cut, so order the correct configuration from the start. The cat is sold at trade price.

What’s in the Kit

• Twin scroll turbo manifold with gasket and studs
• 3″ downpipe
• 3″ twin exit full exhaust
• 3″ V-band clamps

Specifications

• Manifold material: NiResist D5S Type 2
• Runner ID: 38mm
• Manifold weight: 6.4kg
• Scroll pairing: 1-4 / 2-3
• Downpipe/exhaust material: 304L stainless steel
• Exhaust diameter: 3″ throughout
• Exhaust exit: Twin exit
• Turbo compatibility: BorgWarner EFR 6258, 6758, 7163 (T4 IWG)
• AC compatible: Yes

Additional information