Has anyone out there carried out any serious development work on silencer design. We have to comply with strict noise testing to be able to use our cars in UK, and particularly at Goodwood and other tracks. Noise measurement is carried out at 3feet from end of tail pipe at 45degrees, and to reach the required 105db is difficult, particularly when you consider that they are also picking up all of the engines mechanical noise. We have designed a silencer for Robins car, which has also been copied and used on an original race car that requires to be tested at Goodwood regularly, but it is big and too heavy, and I need to make some more silencers now for others cars for this year. I do not believe that I can find an "off the shelf" silencer that will do the job, so I am quite prepared to make them, its just the technology that I am looking for. You know how little room we have to get it in. I also make my own header pipes to copy original patterns (see photos of Robins car on Forum ) Frank