Milltek Secondary Cat-back Exhaust for BMW 1 Series 135i Coupé E82 and Cabriolet E88 (N54) (2008-2010) – Sharper Sound, Reduced Back Pressure
This is Milltek's cat-back system for the BMW 1 Series 135i Coupé E82 and Cabriolet E88 (N55). It replaces everything from the factory catalytic converter rearward with wider-bore pipework, a re-profiled mid-pipe and silencers tuned specifically for this platform, cutting back pressure and sharpening the exhaust note. The factory catalytic converter stays in place, so the car's emissions hardware is left as standard.
It's aimed at owners who want a noticeably different sound and a genuine, if modest, flow improvement without touching anything upstream of the cat: a straightforward bolt-on that doesn't need a remap or any other supporting mods to enjoy.
Specifications
-
System Type: Secondary Cat-back
-
Pipe Diameter: 63.5mm (2.5")
-
Tip Style: Twin 80mm GT80
-
EC Approved: Yes
-
Race System: No
Key Features
- Made from T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration
- Mandrel-bent pipework keeps a constant diameter through every bend for unrestricted flow
- 63.5mm (2.5") pipework
- Replaces the standard exhaust from the catalytic converter back, so the factory cat is retained
- EC approved
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- BMW 1 Series 135i Coupé E82 and Cabriolet E88 (N54) (2008-2010)
- BMW 1 Series 135i Coupé E82 and Cabriolet E88 (N55) (2010-2012)
Not suitable for: the BMW 1 Series 118d & 120d M Sport Coupé (E82), which needs the Milltek Cat-back Exhaust BMW 1 Series 118d 120d M Sport Coupé E82 08-12; the BMW 1 Series M135i 3 & 5 Door (F21 & F20, Non-xDrive), which needs the Milltek Cat-back Exhaust BMW 1 Series M135i 3dr 5dr F21 F20, Non-xDrive 12-16; the BMW 1 Series 118d & 120d M Sport 3-door (E81), which needs the Milltek Cat-back Exhaust BMW 1 Series 118d 120d M Sport 3dr E81 07-12.
Installation
We recommend professional fitting on a ramp. Once fitted, check the tailpipe alignment and re-check all clamps after the first few hundred miles.
Will it fit the BMW 1 Series 135i Coupé E82 and Cabriolet E88 (N55)?
Yes. Milltek lists this part for the BMW 1 Series 135i Coupé E82 and Cabriolet E88 (N55) as well as the other models in the fitment list above.
Does it fit the BMW 1 Series 118d & 120d M Sport Coupé (E82)?
No. For that car, choose the Milltek Cat-back Exhaust BMW 1 Series 118d 120d M Sport Coupé E82 08-12.
Is it road legal?
Every version of this part is listed by Milltek as EC approved.
Do I need a remap?
No. It fits behind the factory catalytic converter, so no software changes are needed.
Does it keep the factory catalytic converter?
Yes. It fits behind the factory catalytic converter, which stays in place.
What is it made from?
T304L aircraft-grade stainless steel, which is anti-magnetic and resists discolouration better than lower grades.
Is there a warranty?
Yes. Milltek products are covered against defects in materials and workmanship. Contact us with your order number if you have a problem.
