do88 BigPack Intercooler & Charge Pipe – BMW 135i / 1M / 335i (E8x / E9x, N54)

OVERVIEW

The N54 in the 135i, 1M and 335i responds well to boost, but the factory intercooler heat-soaks and the plastic charge pipe is a known failure point. The do88 BigPack replaces everything from the intercooler inlet to the throttle body in one kit.

It combines the do88 ICM-350-S aluminum intercooler — 124 percent more core volume, 41 percent more airflow and outlet air 15 °C cooler in do88's testing — with the TR-270S 3" aluminum charge pipe, which flows 36 percent more than stock and has two methanol injection ports.

SPECS

• do88 ICM-350-S aluminum intercooler: core volume 15,517 cm³ vs 6,933 cm³ OE, frontal area 1,151 cm² vs 658 cm² OE
• 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 with a Stage 1 tune (intercooler)
• do88 TR-270S 3" mandrel-bent aluminum charge pipe with CNC sensor flange; 737 CFM vs 542 CFM OE
• Two 1/8-27 NPT methanol injection ports with blanking plugs
• Silicone hoses with 4 layers of polyester/aramid reinforcement
• Replaces OE 17517540035, 13717590304, 13717590306, 11657556554

PARTS INCLUDED

• do88 ICM-350-S intercooler with 2.5" J-pipe, air guide, hoses and hardware
• do88 TR-270S 3" charge pipe with silicone hose and hardware
• 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-270S N54 charge pipe instructions (PDF)
• Flow test (do88): TR-270S charge pipe flow test (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 N54 and the Burger Motorsports JB4 Tuner – BMW N54.
• 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-270-S — do88 BigPack, BMW 135i / 335i N54

VEHICLE APPLICATIONS