Milltek Full Exhaust & Cat Bypass for Porsche Boxster 718 GTS 2.5T (2016-2022) – Maximum Flow, Motorsport Use
This is Milltek's large-bore downpipe and de-cat for the Porsche Boxster 718 GTS 2.5T. It replaces the factory downpipe with a larger-bore pipe and removes the catalytic converter entirely, clearing the single most restrictive point in the exhaust for the biggest flow gain available at this position in the system. It's usually fitted alongside a Stage 2 remap, since the ECU needs to be told to expect the different readings the lambda sensors give once the cat's gone. It's offered in 5 tailpipe finishes, so you can pick the setup that suits how the car's used.
It's built for owners already committed to a serious power upgrade rather than a casual bolt-on, so pair it with the matching Milltek cat-back system for the full effect.
Because it removes the cat, it's intended for off-road and competition use. A de-catted car will fail an MOT emissions test and isn't legal to use on UK roads.
Specifications
-
System Type: Full System (including Cat Replacement Pipe)
-
Pipe Diameter: 63.5mm (2.5")
-
EC Approved: No
-
Race System: Yes
-
Fitting Time: approx. 2 to 2.5 hours (Milltek figure)
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
- Removes the factory catalyst for maximum flow (off-road and competition use only)
- Choice of 5 tailpipe finishes: GT-100 Burnt Titanium, JET-100 Carbon Fibre, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium
- Designed, developed and manufactured in the UK by Milltek Sport
Fitment
- Porsche Boxster 718 GTS 2.5T (2016-2022)
- Porsche Cayman 718 GTS 2.5T (2016-2020)
Not suitable for: any model, engine or body style not listed above. Check your car before ordering.
Installation
Milltek quotes a fitting time of approx. 2 to 2.5 hours. Some versions: Full System with Decat & Burnt Titanium GT-100 Trims (Requires Stage 2 ECU Software). Some versions: Full System with Decat & Carbon JET-100 Trims (Requires Stage 2 ECU Software). Some versions: Full System with Decat & Cerakote Black GT-100 Trims (Requires Stage 2 ECU Software). Some versions: Full System with Decat & Polished GT-100 Trims (Requires Stage 2 ECU Software). This work involves removing parts close to the turbo and engine, so we recommend fitting by a specialist with a ramp and suitable software support.
Upgrade Further
Also available from Milltek for this car: Milltek Filter-back Exhaust Porsche Boxster 718 GTS 2.5T 16-22.
Which tailpipe finishes are available?
You can choose from: GT-100 Burnt Titanium, JET-100 Carbon Fibre, GT-100 Cerakote Black, GT-100 Polished, GT-100 Titanium. The finish is cosmetic and does not change the sound.
Will it fit the Porsche Cayman 718 GTS 2.5T?
Yes. Milltek lists this part for the Porsche Cayman 718 GTS 2.5T as well as the other models in the fitment list above.
Is it road legal?
No. Removing the catalyst means the car will fail an MOT emissions test, so it is for off-road and competition use only.
Do I need a remap?
Yes. Milltek notes: "Full System with Decat & Burnt Titanium GT-100 Trims (Requires Stage 2 ECU Software)". Without suitable software the engine management is likely to log faults.
Will removing the cat cause a warning light?
Without suitable software it is likely to, as the ECU expects the readings a working catalyst gives. This is why Milltek pairs it with a remap.
How long does it take to fit?
Milltek quotes approx. 2 to 2.5 hours.
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.
