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Custom car parts FAQ

What is the difference between a dedicated silencer and an universal silencer?

     The main advantage of a dedicated performer exhaust silencer is that it is designed exactly for a specified car model. This means that the construction is a result of a series of calculations to specify capacity of the silencer can, a suitable cross-section of silencer's inlet pipes, and the form of the insert that has a key impact on a silencer’s noise level and on the ratio of counter-pressures. In this way future operation will be as comfortable as possible. Thanks to the fact that the outer structure of the silencer (fitted inlet tube and fixing hooks) is thoroughly worked out, it can be mounted in place of a standard silencer, just on the original fitting facility. The universal silencer is offered usually when a dedicated silencer is not available and specifically fitted to specifications of a particular car. Our universal silencers have optimal structures which enable them to match the most models of cars. However, it has to be taken into account that the universal silencer never achieves efficiency of a dedicated silencer and can generate some difficulties when installing on a car that would be avoided using a dedicated product. An essential difference between universal and dedicated silencers is that it may be difficult to receive an Official Certification document and to meet requirements of Certification directives related to the dedicated silencers that enable safe and problem-free driving through the whole Europe whilst a universal silencer cannot provide that in full.

How long is the guarantee and how long is the life expectancy of your silencers?

     The products are under guarantee for 24 months. The silencer, subject to its operational conditions, should maintain its operational parameters for at least 3 years. We have been informed by our customers that a number of our silences have lasted for five years and more. The working life depends mostly on way of operation, thus cars driven long distances in single rides (hence enabling for 'evaporation' of silencers) used to show longer working life of their exhaust systems than cars operated mostly in urban traffic.
What is the characteristics of racing-type silencers?

     Since the dedicated silencers meet noise standard requirements, they are recognised by a rather low noise level, a 'slight bass' when reducing rotations. Regarding an universal silencer, all depends on its adjustment to the specific car model. Upon installation of a new silencer, improvement in power, dynamics and/or operation flexibility are usually noticed.
What materials are the silencer and its inlet/outlet made of?
     Silencers are made of aluminium steel, whilst their inlets and/or outlets are made of stainless steel. The exception is the NRS series, where the whole silencer is made completely of stainless steel.
What tube diameters can the silencer inlets/outlets be mounted on and what is the way of their installation?

     The exhaust end pipes may be divided into exhaust embellishers, mounting pipes, single or double tailpipes. The mounting pipe is fixed directly to the silencer bottom by welding. The single and double tailpipes are fastened by clamping rings or by welding on. They are furnished with pipe sockets of a shape adjusted to the outlet pipe diameter. Most popular diameters are of 42 / 45 / 50 / 55 / 60 mm.
Does the racing-type silencer match Diesel engines ?

     When it comes to old models the effect was not satisfactory. However, in new generation Diesel engines (turbo models in particular) sport silencers and other parts can be successfully mounted. You will be pleased with the improved characteristics and slightly changed sound of your car.
Do you manufacture silencers made entirely of stainless steel?

     There is a possibility to order a silencer made of stainless steel. It depends on our technical capabilities. The price is subject to an individual agreement. Moreover, our Offer includes some dedicated products of the NRS series, and our salesmen are eager to provide our Customers with all respective details.
Do you offer silencers with noise level adjustment?

     Since the legal regulations define clearly the noise limits of exhaust systems, and our Company offers an engine timbre aligned with to satisfy our customer expectations and ensuring the noise limit is not exceeded, we do not plan at the moment to offer such a solution because it does not assure problem-free operation and can generate some regrettable consequences for the user/driver.


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  • Greggson Ltd
  • Registered Address:
    Victory Business Centre Unit 17
    Somers Road North
    PO1 1PJ
    United Kigdom
    Company No: 6956261 
    VAT No: GB 974 4306 05
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