do88 Charge Pipe – BMW 135i / 335i (E8x / E9x, N55)

OVERVIEW

The plastic charge pipe between the intercooler and throttle body on the E-series N55 is a known failure point once boost goes up. The do88 TR-290S replaces it with a 3" mandrel-bent seamless aluminum pipe with a CNC-machined sensor flange.

do88 measured 750 CFM against 542 CFM for the factory pipe at the same pressure drop — 38 percent more — on their SuperFlow bench and in the car. Two 1/8-27 NPT ports are ready for methanol injection, and the silicone hose has four layers of polyester/aramid reinforcement.

SPECS

• 3" mandrel-bent seamless aluminum pipe
• CNC-machined sensor flange
• Airflow at 0.1 bar (1.45 psi): 750 CFM vs 542 CFM OE — about 38 percent more
• Two 1/8-27 NPT methanol injection ports with blanking plugs
• Silicone hose with 4 layers of polyester/aramid reinforcement
• Replaces OE 13717599294 and 13717615026

PARTS INCLUDED

• 1 × do88 aluminum charge pipe
• Silicone hose
• All installation hardware
• 2 × blanking plugs

TECH RESOURCES

• Required extras: none — all hardware included. A tune is needed to see a gain over OE.
• Installation instructions (do88): TR-290S N55 charge pipe installation instructions (PDF)
• Installation notes: remove the engine cover and OE charge pipe, transfer the sensor to the do88 flange, and fit the pipe and hose with the supplied hardware.
• Tuning: pairs with the MHD Super License – BMW N55 (E-Series) and the Burger Motorsports JB4 Tuner – BMW N55 (E-Chassis).
• 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-290S — do88 Pressure Pipe, BMW 135i / 335i N55

VEHICLE APPLICATIONS