i just put on the resonated milltek system on my tiptronic avant. it is not much louder than stock with the stock cat & downpipe. it has a deeper note and is just ever so slightly louder than stock. i wish it was louder, BUT it is awesome on the highway. NO drone whatsoever.
i have never dyno'd the car, so i cannot quantify the difference, BUT i think it makes the car run a lot stronger. with my k04 the power seems to come on earlier and not spike as hard as it did. it's much smoother and the car just seems to breathe better.
i am going to add a bigger dp and get a hfc or tp. i'm sure that will make it a little louder.
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