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Evolution Racewerks 4 inch downpipe for BMW N55 F-Chassis

Evolution Racewerks 4" Downpipe — N55 (F-Chassis)

$615.00

Evolution Racewerks 4" downpipe for the single-turbo N55. The N55 is the bridge engine between the older twin-turbo I6 and the modern B58. Smaller exhaust mass-flow than either, but the OEM downpipe restriction still caps Stage 2 + 3 N55 builds at peak power. ER's 4" replacement opens that restriction completely.

N55 single-turbo math

The N55 uses a single twin-scroll turbo. One downpipe to replace (not the twin setup of the S55). ER's 4" pipe handles the N55's airflow ceiling cleanly through Stage 3 on a supporting-hardware build.

Real-world output difference

Community feedback on calibrated N55 builds consistently reports a measurable gain from the downpipe alone — the pipe removes a restriction the OEM section imposes for noise and emissions compliance, which the tune can then capitalize on.

Catless vs Catted

Catless: race-only, maximum flow. CEL on stock cal.

High-Flow Catted: 200-cell metallic catalyst. CEL-clean on stock cal.

What Evolution Racewerks builds in

  • 100% 304-grade stainless steel construction
  • Mandrel-bent piping — smooth transitions, no flow restrictions at the bends
  • 100% TIG-welded by ER's in-house fabricators
  • Precision CNC-machined flanges (billet 304 stainless)
  • Made in the USA — manufactured in-house at ER's California facility
  • Limited Lifetime Warranty against manufacturing defects

EGT bung included — standard on every Esse Werks ER order

Evolution Racewerks offers the EGT (Exhaust Gas Temperature) sensor bung as an optional add-on on their direct catalog. We include it on every ER downpipe / mid pipe we ship — no upcharge. Comes pre-installed with a 1/8" NPT plug so you don't need to run the EGT sensor immediately. When you're ready to add EGT monitoring to your build (recommended at Stage 2 and above for any sustained-load driving), the bung is already there.

SwainTech White Lightning — our signature coating

When we coat a part, we use one coating: SwainTech White Lightning — a true ceramic thermal barrier applied about 0.015" thick (versus roughly 0.002" for paint-style "ceramic" finishes) and sprayed molten so it bonds to the metal instead of sitting on top. It cuts radiant heat off the exhaust by roughly 35–55%, dropping underhood and intake temperatures, and keeps heat inside the pipe where it sustains exhaust velocity and scavenging. And it's white — a deliberate signature in a market that otherwise all looks the same in black. Select it above.

California restriction

This product is not for sale, installation, or use on licensed vehicles in the State of California. 49-state product. Vehicle Compliance Waiver signed at order intake. International orders ship without restriction.

Install

~3-4 hours at a competent shop. Reuses OEM hardware where applicable. Includes all hardware for complete installation.

Fitment

All N55 BMW applications — F20/F21 M135i, F22/F23 M235i (2014-2016 N55), F30 335i (2012-2015), F31 335i Touring, F32 435i (2014-2016), F33 435i, F36 435i, F87 M2 (2016-2018 pre-Competition).

This part is the downpipe-side Core of every N55 Stage 2 build. The Stage 2 Kit — N55 packages the matched parts + calibration for 8% under à la carte.

Fits engine N55
Fits chassis F20 · F21 · F22 · F23 · F30 · F31 · F32 · F33 · F36 · F87
Category Exhaust
Manufacturer Evolution Racewerks
Install effort ~3.5 hours
What this is

A Part Recalibration is one focused revision built around the part you just bought. We take logs on your car as it runs now, on your current tune, then make a single full revision so this specific part delivers what it should. Hardware only does its job with a calibration shaped around it.

We bundle that tuning with the part right here, whatever brand the hardware is. If you want a fresh start across all your hardware, a Full Tune is the step up: a new base map, three revisions, and a written report.

This is a bootmod3 calibration. We tune through your own active BM3 license, so you'll need bootmod3 active on your car to load it.

Ships freight from Boca Raton, FL — additional fees may apply at checkout.

Step up to a Full Tune?

You've added a Part Recalibration to more than one part. At that point a complete tune does more for you: a Full Tune lays down a fresh base map and three revisions so all of your new hardware is dialed in together, with a written report at the end. We can roll your recalibrations into one Full Tune for $395 — below our standalone Full Tune, which starts at $495 for a four-cylinder and $595 for a six.

The Full Tune is a bootmod3 calibration — it loads through your active BM3 license, the same one you confirmed for the recalibration.
WHY WE SHIP EVOLUTION RACEWERKS
Cooling is the first thing to run out on a boosted BMW, and Evolution Racewerks builds the charge coolers and intercoolers that buy back the headroom. The bar-and-plate cores carry more thermal mass than the factory units, which is what keeps intake temps from climbing into timing-pull territory on a back-to-back pull. Their charge pipes also delete the factory plastic coupler that is a known weak point under boost. When a Stage 1 or Stage 2 car is heat-soaking on the second hard pull, a competition cooler from Evolution Racewerks is usually the fix that holds the tune's numbers session after session.