do88 BigPack Intercooler, Charge Pipe & Turbo Outlet – BMW 135i / 335i (E8x / E9x, N55)

OVERVIEW

On the E-series N55 135i and 335i, the factory intercooler, plastic charge pipe and turbo outlet hose all hold power back once the car is tuned. The do88 BigPack replaces everything from the turbo outlet to the throttle body.

It combines the do88 ICM-350-S intercooler — 124 percent more core volume and outlet air 15 °C cooler in do88's testing on a 335xi N55 — with the TR-290S 3" aluminum charge pipe (38 percent more flow, methanol ports) and the upgraded turbo outlet hose with a CNC-machined adapter.

SPECS

• do88 ICM-350-S aluminum intercooler: core volume 15,517 cm³ vs 6,933 cm³ OE, frontal area 75 percent larger
• Intercooler airflow at 0.15 bar: 498 CFM vs 354 CFM OE; outlet air 43 °C vs 58 °C OE
• Peak power gain of 13 hp measured on a 335xi N55 with a Stage 1 tune (intercooler)
• do88 TR-290S 3" mandrel-bent aluminum charge pipe; 750 CFM vs 542 CFM OE
• Two 1/8-27 NPT methanol injection ports with blanking plugs
• Turbo outlet hose: CNC-machined adapter and 4-layer aramid silicone
• Replaces OE 17517540035, 13717590304, 13717599294, 13717615026, 13717599293

PARTS INCLUDED

• do88 ICM-350-S intercooler with J-pipe, air guide, hoses and hardware
• do88 TR-290S 3" charge pipe with silicone hose and hardware
• do88 turbo outlet hose with CNC-machined adapter
• Blanking plugs for the methanol ports

TECH RESOURCES

• Required extras: none — all hardware included. The OE plastic air guide is trimmed during installation.
• Installation instructions (do88): ICM-350-S intercooler instructions (PDF)
• Installation instructions (do88): TR-290S N55 charge pipe instructions (PDF)
• Notes: ships in two boxes. The charge pipe only shows a gain over OE once the engine is tuned.
• 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

• BIG-290-S — do88 BigPack, BMW 135i / 335i N55

VEHICLE APPLICATIONS