NOxBUSTER® City - Proven retrofit solutions for ULEZ and CAZ NOx reduction retrofit programs

Excalibre are the proud UK partners of market-leading, Proventia Oy. The Proventia NOxBUSTER® City is a retrofit solution for ULZ and CAZ, which enables Euro 3, 4 or 5 buses and trucks to meet Euro 6 standards.

Proventia are based in in Oulu Finland and are a leading developer and manufacturer of retrofit and OE emission control systems. The systems have full TfL and CVRAS approval ensuring compliance with the Ultra low emission zone (ULEZ) and Clean Air Zones across the UK. Over 1,000 systems have been installed across all major London bus operators.

partnership with  

Proventia have approved systems for many vehicles including...

Key Features

High NOx reduction rates even at low exhaust temperatures (below 200°C)

Proven results over the Millbrook MLTB, LowCVP UK Bus (LUB), Coach (LUC), HGV and RCV Cycle

Proven results in PEMS tests from an independent test laboratory

Proven results of real city driving conditions from an independent test laboratory (WHVC cycle)

Proven results of real city driving conditions from independent testing laboratories

Operates with standard AdBlue®, no additional infrastructure required

Optimised urea mixing technology enable urea injection at low temperatures – no deposits

Advanced insulation technology maintains heat inside the system and improves SCR operation

Low surface temperature, no risk to other sensitive engine parts

Easy installation and maintenance, similar to existing AdBlue systems

Continuous NOx emissions and performance monitoring with a web-based Proventia PROCARE™ Drive

Installation and Maintenance

Excalibre has a workshop and offices based in Rainham Essex. A team of locally based technicians install and maintain the systems.

After installation we provide a comprehensive service and maintenance program including DPF cleaning.

PROCARE TMDRIVE Remote Telematics

The Proventia ProCareTMDrive is a compact device that continuously monitors the performance and operation of the system providing real time emissions data. Engine out and Tailpipe NOx are monitored and logged enabling NOx reduction to be calculated at any time. DPF back pressure is also monitored along with catalyst and DPF temperatures.

Coupled with location tracking it enables the operator or authority to monitor the performance of the vehicle. All data is available in spreadsheet format to enable whole fleet data to be collected and analysed. All software is developed in house enabling custom reporting to be offered for large fleets.

Contact us today

Please contact us for a no-obligation discussion – 01594 887414 or email

Aftermarket Silencers

Excalibre specialize in aftermarket silencers for Euro 4 & 5 vehicles. We supply a growing range of silencers for truck and bus applications and also manufacture custom designs in house.

Emissions Control

In partnership with Synergy Catalyst and Performance Industries we supply catalytic convertors for a wide range of industrial and automotive applications. We also supply SCR catalyst and DPF’s.