16/10/2026
VW T4 Camper In For The PP Tuning Treatment 🚐💨
We’ve been trying to keep up with the socials, but the workshop has been absolutely flat out. Not complaining though… busy is good! 😅
This VW T4 coachbuilt camper came in for a PP Tuning stainless steel exhaust made using our mandrel bender machine, plus setup and tuning on its 2.4D turbo conversion.
The exhaust was custom-built in stainless steel using our mandrel bender machine, which keeps the tubing diameter consistent through each curve. Unlike standard crush-bent pipework, mandrel bending prevents the bends from narrowing or becoming restricted, helping the exhaust gases flow more freely.
Using the mandrel bender also means there are hardly any welds in the pipework. This gives the exhaust a cleaner finish, reduces potential weak points and helps create a stronger, more durable system.
That means smoother gas flow, fewer restrictions and a better-designed exhaust system, while still allowing us to route the pipework neatly around the chassis and underbody. The result is a strong, durable and free-flowing exhaust that’s built specifically for the vehicle rather than adapted from off-the-shelf sections.
The stainless-steel construction also offers excellent corrosion resistance, making it ideal for a camper that needs to remain reliable for years to come.
This one is all mechanical tuning, and let’s just say… someone had already had a little fiddle before it arrived 👀
The trouble is, without a rolling road dyno, you’re never going to get it properly dialled in.
When it arrived, it was making:
80bhp
180Nm torque
With a medium smoke level right through the rev range.
Front end into service mode, access sorted, and then we got stuck into setting it up properly 🔧
After multiple small adjustments, testing, checking and fine-tuning, we finished with:
94bhp
206Nm torque
That’s a nice gain of +14bhp and +26Nm, with a much cleaner setup and only a low, acceptable smoke level at higher RPM.
Not bad at all for an old-school T4 camper! 😎
Mechanical diesel tuning done properly. No guesswork. No pub figures. Just proper dyno-backed results.
