do88 Charge Pipe – Toyota GR Supra 3.0 (A90) / BMW Z4 M40i (G29), B58

OVERVIEW

The plastic charge pipe on the 3.0 GR Supra and Z4 M40i is fragile — it can let go on a tuned car and even on stock cars during track use. do88 recommends replacing it before you add boost, and the TR-390 is their answer: a two-piece aluminum charge pipe made up of a 60 mm lower pipe and a 76 mm upper pipe, both mandrel-bent, joined by an aramid-reinforced three-hump silicone hose that absorbs thermal movement.

The connection ends are CNC-machined from 6063 aluminum with a 3 mm wall so they hold their shape under tight clamps, and Mikalor clamps with inner rings are supplied. do88 rates it at 27 percent more flow than OEM — 558 CFM against 439 CFM at 150 mbar. Two 1/8" NPT ports take methanol injection or a boost sensor (plugs included), and it clears the engine cover.

SPECS

• 60 mm lower and 76 mm upper pipes, mandrel-bent aluminum
• CNC-machined 6063 aluminum ends with 3 mm wall
• Aramid-reinforced three-hump silicone joining hose
• Flow: 558 CFM vs 439 CFM OEM at 150 mbar — 27 percent more (do88 testing)
• Two 1/8" NPT ports for methanol injection or boost sensor, plugs included
• Mikalor hose clamps with inner rings
• Black powder coat; clears the engine cover
• Replaces OE 13718651066

PARTS INCLUDED

• 2 × do88 charge pipes (upper and lower)
• 1 × do88 silicone joining hose
• 2 × hose clamps with inner ring
• 1 × M6×16 screw
• 2 × 1/8" NPT plugs

TECH RESOURCES

• Required extras: none — the OE seals, turbo-outlet clip and sensors transfer to the do88 pipes.
• Installation instructions (do88): TR-390 GR Supra / Z4 M40i charge pipe installation instructions (PDF)
• Installation notes: remove the airbox and engine cover, disconnect the sensors and remove the inlet pipe and OE charge pipe. Transfer the OE seals (turbo-outlet seal lip pointing into the pipe), clip and sensors, fit the silicone hose and throttle-body pipe loosely, secure with the OE T30 screws, then set the angle and tighten.
• Torque: hose clamps 5 Nm once the hose is seated at both ends.
• Tuning: do88 recommends fitting this before tuning. Pairs with the Bootmod3 B58 Tune – GR Supra, MHD Super License – GR Supra and, for the Z4, the Bootmod3 B58 Tune – BMW.
• For BMW M240i / M340i / M440i and other G-series B58 cars, see the do88 TR-390-GX version.
• 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-390 — do88 Charge Pipe, BMW Z4 M40i G29 / Toyota GR Supra A90

VEHICLE APPLICATIONS