Hello together, wanted to ask if someone knows which manufacturer built the exhaust system for our Audis? there between kat and msd and between msd and esd are constantly leaking with me I wanted to get me a new msd (original) a corresponding offer also found, with the assertion “first equipment quality” exhaust system is from HJS. I only need the msd, but the ESD, which is there then could be installed on the Audi of my father. Thanks scho scho nmal Greeting andreas