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I'm currently testing a regular steel version (meaning, it will rust) of the GHL exhaust system made for the A6. GHL is now making the production models in stainless. I've had the system for 3 weeks or so, and it sounds very good - drone is not bad (and getting better by the day), and it has a very deep tone. The only thing I'd like is for it to be a bit louder....so I'm going to try the standard GHL system combined with Dynapad (which I already have in the car).
If GHL is able to send me a demo of their regular system, somebody else in the area that is considering GHL and has an A6 can try the system out to see if it is for them. Kevin at HP in Mundelein does my work, so he'd be the best shop to have do it. A friend of mine has first dibs, but if he declines and anybody is interested, send me an email.