Introducing our latest exhaust system development in the shape of the Signature “QT” (Quiet Technology) systems for the V6-engined Exige and Evora models. The exhaust is a direct replacement for the original (or aftermarket) rear silencer and should work with any manifold and link pipe (“Y Pipe”) combination.
Many owners are complaining that they are being asked to leave, or can no longer attend, track days and track evenings due to exceeding the drive-by noise levels for the event. At the same time, ‘noisy days’ at UK circuits are becoming increasingly rare as circuits feel the pressure of increasingly stringent local government noise enforcements.
The challenge is to create a quiet exhaust system that will not only reduce noise without restricting flow, but is also durable for track use without need for repacking. In April we completed the development, and our new system fits the criteria perfectly.
At Brands Hatch, under close scrutiny of MSV officials and staff, we successfully tested the prototype QT silencer fitted to an Exige EX460. The drive-by noise limit on the day was 92dB. The tuned Exige also features our Komo-Tec sports catalyst, large-bore manifolds and carbon CAI airbox. The testing was carried out back-to-back with the original Lotus factory exhaust system. The results speak for themselves…
| — OEM — | — QT — | |
| Static Noise (Cold)* | 96dB | 95dB |
| Drive-By (Cold) | 86dB | 82dB |
| Drive-By (Hot) | 95dB | 84dB |
| Maximum | 97dB | 89dB |
*Note that the static noise is best measured with the exhaust system hot.
Having an industry-accredited exhaust manufacturing partner has always been a benefit when we design a new system, and this is no exception. All our exhaust systems are manufactured from scratch, to our own specific requirements, with no off-the-shelf silencers or pipes used during construction. Exhausts and manifolds are flow-bench tested to check flow rates. This gives us the freedom to develop a more advanced and effective product that is fit for purpose, designed, engineered and manufactured in the United Kingdom.
Based on customer feedback, the other models in our Signature range for earlier cars are compliant with circuit noise regulations. Testing at our workshops and track-side aligns with this feedback – especially with Exige S models (2006 on) where our Signature systems achieve around 98-99dB static and around 89-92dB drive-by when hot. We will be producing some of the Signature QT exhausts for more highly-tuned Toyota and Rover engined cars later in the year.
Signature QT V6 exhausts will be in stock in the new few weeks. More information and pricing will appear on the website once the first systems are in stock. In the mean time we think they will be very popular, so contact us to get your name on the list for one now!
Update: Video from our testing at Mallory Park.
Video of Signature QT exhaust in action on Komo-Tec EX460 Exige at Mallory Park
Update: Before and after performance figures from a recent Komo-Tec EV4-460 Upgrade we carried out.
Signature QT Exhaust Comparison to Standard Evora 400 Exhaust
