do88 Performance Charge Pipe – BMW M2 / M3 / M4 / X3 M / X4 M (G87 / G80 / G82 / F97 / F98, S58)

OVERVIEW

On the S58, boost from both turbochargers meets in a plastic Y-pipe just ahead of the throttle body. It copes on a stock car, but once boost and charge temperatures go up with a tune or upgraded turbos, that plastic becomes the weak link in the charge system — and a cracked Y-pipe means a sudden loss of boost on the street or the track.

The do88 TR-420 replaces the factory Y-pipe and the rear-turbo charge pipe with a cast aluminum Y-pipe, a mandrel-bent aluminum rear pipe, and CNC-machined adapters at the front turbo outlet and the throttle body. do88 rates the system 15 percent less restrictive than stock — 960 CFM at 150 mbar on their flow bench, against 835 CFM for the factory pipe — and opens up the throttle body quick-disconnect to match the throttle's internal diameter. Two 1/8" NPT ports are machined in for methanol injection or an extra boost sensor, with plugs supplied if you don't need them.

It installs in the factory location with no cutting, reuses the factory sensors, seal rings and C-clips, and comes with every hose, clamp and screw needed to replace the complete stock charge pipe system.

SPECS

• Y-pipe: cast aluminum; rear turbo charge pipe: mandrel-bent aluminum
• CNC-machined front turbo outlet adapter and billet throttle body adapter
• Throttle body quick-disconnect sized to match the throttle's internal diameter
• Flow: 960 CFM at 150 mbar (2.17 psi) vs. 835 CFM for the OEM pipe (do88 flow bench) — 15 percent less restrictive than stock
• Two 1/8" NPT auxiliary ports for methanol injection or boost pressure sensors, plugs included
• Direct fit in the factory location; reuses the OE sensors, seal rings, C-clips and bushings
• Replaces OE 13718054844, 13718054843, 13718054842, 13628626176, 13628637896, 13718054840, 13718089754, 13718054841
• Developed and tested in-house by do88 in Sweden

PARTS INCLUDED

• Cast aluminum Y-pipe
• Rear turbo outlet charge pipe
• Silicone hose – rear turbo outlet pipe to Y-pipe
• Silicone hose – front turbo to Y-pipe
• Silicone hose – Y-pipe to throttle body adapter
• Front turbo outlet adapter
• Throttle body adapter
• 1 × M6×20 black stainless button flange screw
• 3 × M6×25 countersunk screws
• 4 × hose clamps, 50–70 mm
• 2 × hose clamps, 70–90 mm
• Plugs for the two 1/8" NPT auxiliary ports

TECH RESOURCES

• Required extras: none. The kit is complete — the factory sensors, seal rings, C-clips and bushings transfer over to the do88 parts.
• Shop supplies: a little rubber-safe lubricant for the sensor O-rings and bushings during reassembly.
• Installation instructions (do88): TR-420 S58 charge pipe installation instructions (PDF)
• Installation notes: the front of the car comes apart for access — strut tower braces, engine cover, upper bumper cover and front support plate, radiator support bar, left intake, V-brace and fan shroud, then the radiator tilts forward. Unplug the two sensors on the Y-pipe, move the auxiliary water pump aside, and remove the throttle body hose, Y-pipe (4 × 10 mm) and rear turbo pipe.
• Throttle body adapter: fits with the three supplied M6×25 Torx T30 screws. Access is tight; do88 suggests doing this step from underneath with the under-engine aluminum plate removed.
• Reassembly: install seal rings with the small lip facing the pipe opening, secure the temperature sensor with the supplied M6×20 screw, and torque all hose clamps to 5 Nm.
• X3 M / X4 M: do88's instructions are shot on an M2; panel and cover removal differs slightly on the other models this part fits.
• Tuning: no tune is required. It is most valuable on tuned cars — pairs with the Bootmod3 S58 Tune, MHD Super License – S58, Burger Motorsports JB4 – S58 and Pure Turbos Stage 2+ – S58.
• No CARB EO is published for this part — off-road / competition use only in California.
• Price is for the item only; labor is not included.

PART NUMBER

• TR-420 — do88 Charge Pipe, BMW S58 (G87 / G80 / G82 / F97 / F98)

VEHICLE APPLICATIONS