Best valved exhaust for BMW 1M E82 N54

Your vehicle.

All our exhausts for this generation, version by version, are brought together on one page: BMW 1 Series E82 / E88 Valved Exhaust.

The 1M is not a slightly more powerful 1 Series coupe: it is a car designed by the M division, with suspension and brakes from the M3 E92, widened wings and a twin-turbo six-cylinder. Produced for barely more than a year, it remains a rarity. Here is what sets it apart, and what that changes for its exhaust.

Body style

E82 coupe, two doors, four seats

Career

On sale in spring 2011, produced until June 2012

Engine

N54: 2,979 cm³ on six cylinders in line, twin-turbo, direct injection

Factory output

340 hp (250 kW) at 5,900 rpm

Torque

450 Nm from 1,500 to 4,500 rpm, 500 Nm on overboost

Gearbox and drivetrain

Six-speed manual, rear-wheel drive, M variable-lock differential

Chassis

Aluminium axles and brakes from the M3 E92; 1,542 mm track widths

Tailpipes

Four, the signature of the M exhaust

A compact M car, built in a small series

BMW revealed the 1M Coupe in December 2010, under the official name 1 Series M Coupe, for arrival at dealers in spring 2011, in limited numbers and with a deliberately reduced choice of options. Only three colours were in the catalogue, including a Valencia orange reserved for this model. Production stopped in June 2012.

Our product page therefore covers the whole production, 2011 and 2012. There is only one body style, the E82 coupe, and only one mechanical version: no convertible, no automatic gearbox, no all-wheel drive. For the exhaust, this simplicity is valuable, and your VIN is enough to confirm the car before building.

Such rarity explains why many owners hesitate to modify their 1M. The Rog line is fitted with clamps and gaskets, without cutting anything: the factory line can be kept and refitted one day, if you wish.

340 hp and the overboost

In the 1M, the N54 delivers 340 hp (250 kW) at 5,900 rpm and 450 Nm between 1,500 and 4,500 rpm. Under full load, an electronically controlled overboost function briefly adds 50 Nm, for a peak of 500 Nm. BMW quoted 4.9 seconds from 0 to 100 km/h and a speed limited to 250 km/h, for 1,495 kg DIN.

American documents said 335 hp: it is the same power, expressed in the local unit. Further down, the bars on our product page set these factory values against those published by tuners with downpipes and revised mapping.

Stage 2: published figures with the front section and an ECU remap carried out by a tuner.

What the 1M owes to the M3

To house the M3 E92's five-link aluminium rear axle and its differential, BMW had to widen the 1 Series body: the 1M has identical track widths of 1,542 mm front and rear, and wings clearly wider than those of the 135i. At the front, almost all the suspension parts are aluminium. The braking also comes from the M3, with 360 mm ventilated and drilled discs at the front.

The short-ratio six-speed manual gearbox sends torque to the rear wheels through an M variable-lock differential. At the wheel, an M Drive button makes the accelerator response sharper, and M Dynamic mode relaxes the stability control; a long press switches it off entirely.

On the road, that gives a short, wide, lively car whose handling made its reputation. It is also what makes the gap with its factory sound so striking.

The 1M's N54

The N54 is an all-aluminium inline-six of 2,979 cm³, with direct injection, supercharged by two small turbos: each receives the gases of three cylinders. This parallel layout gives a quick response and torque very early in the revs, which suits a light coupe with a manual gearbox.

This engine is known elsewhere: the 135i E82, the pre-2010 335i E9x and the Z4 E89 received it, with different settings and lines specific to each body. The M2 F87, which came later, has its own engine and its own guide. The 1M's line fits only the 1M.

Two turbos mean two downpipes, each with its catalytic converter: that is the upstream part of the line, its front section. Behind them, the cat-back runs to the four tips of the rear bumper; this portion forges most of the sound.

A sound too polished for this car

BMW had worked on the 1M's acoustics, and its four tips set the tone. Yet most of the N54's voice stays on the way. The two turbines take their share of the gases' energy, so of the sound, and the factory line, compartmentalised to meet regulations, erases what remains. At idle, the 1M purrs; at high revs, it sings much quieter than it accelerates.

Freed by the Rog line, flaps open, the N54 takes on a rasping, metallic tone that swells from gear to gear, with crisp pops when you lift off. The straight pipe keeps this grain as it is; the resonator gives it a rounder, slightly softer voice, and the 1M stays just as sporty to the ear. Both are the same price.

With the flaps closed, the gases run back through the muffler chambers: the 1M is presentable again for an early-morning exit from a car park or a motorway leg to the circuit.

Rog flaps and remote

The 1M's line is ordered with the Rog flap system. The flaps arrive fitted, along with a small box that hides in the boot and a two-button remote. Their position depends neither on revs nor on the mode engaged: open, they stay open until you close them, and vice versa.

On a car you readily take to the track, this manual control is an asset: you open before going out on track and leave the flaps like that for the whole session, then close for the road home. In town as on the motorway, one touch is enough to return to a level close to factory.

Tips, material and finishes

For the four outlets, two families: our Rog tips, included, in blued titanium, gloss black or chrome; or, as an option, carbon tips with the M logo, forged, black or combined with titanium. The line also exists without tips.

304 stainless steel stands up to winters and to years, and gives the N54 a full note. Titanium takes about 40% off the mass of the line, for the same layout, at the rear of an already compact coupe, and its voice becomes clearer in the revs. Brushed, gold or purple: the finish does not change the price.

What the 1M product page covers

In addition to the cat-back, the product page adds as an option the two N54 downpipes, under the name "Manifold": factory, 200-cell, compatible with emissions control that stays active, 100-cell sport catalytic converter, or catalyst-free, a version meant for the circuit.

With the line alone, the 1M keeps its ECU and its 340 hp: it gains a voice, not horsepower. Power comes through the downpipes and mapping revised by a tuner. Once the line is made to your VIN, it is your garage that fits it, without welding.

Configure your exhaust.

How the exhaust is put together

On the 1M, the Rog cat-back connects behind the two downpipes and carries the gases to the four tips of the bumper, with its pipes, its muffler and its flaps. These two downpipes, one per turbo and each with its catalytic converter, make up the front section, sold as an option and named "Manifold" on the product page.

Each choice explained in detail, from sound to material: How to configure your exhaust.

Three recommended configurations.

• Rarity preserved

  • Stainless steel
  • Factory downpipes
  • Straight pipe
  • Rog blued titanium tips

  For a collector's 1M that drives little and well: the N54 regains its voice, BMW's downpipes stay in place, and the factory line can be put away in the garage.

  View this configuration

• Mountain roads

  • Titanium
  • 200-cell sports catalytic converter
  • Straight pipe

  For a 1M that goes out at weekends on winding roads: 200-cell downpipes for more presence with the emissions control kept, and a rear lightened by titanium.

  View this configuration

• Track days

  • Gold titanium
  • Decat
  • Straight pipe
  • Carbon tips with the M logo

  For a 1M that strings together track sessions: catalyst-free downpipes reserved for the track, flaps open all day, and carbon tips to match the M spirit.

  View this configuration

From order to fitting.

VIN, manufacture, delivery, fitting and warranty, step by step

Questions.

Further reading.

• All our BMW 1 Series E82 and E88 lines
• BMW 135i E82 / E88 guide
• BMW 335i N54 E90 to E93 guide
• BMW M2 F87 guide