I have one in my Stage 2 3.0 TFSI A5 Coupe (which are a drone hazard) and it has removed 99% of it and under WOT the car is very tough with no drone, formula 1 sounding tough tbh... the best indication I can give you is the video that they have on their website with an S4, all 3.0 TFSI S4/S5/A4/A5 have the same model Corsa exhaust!... I first bought the JHM/FI exhaust (sitting in my garage if anyone wants it!) which was a droning piece of sh*t
The only issue sometimes when on the freeway and the speed may drop to 80km and car stays in 7th gear, I have to drop to 6th gear to remove some of the cabin noise. Also whilst going uphills on freeways in cruise at 100km in 7th the cabin noise does resonate in the cabin slightly but is very bearable for what you want
Also if you have an S4, it will be perfect for the Corsa as the setup of the back seats / boot act as more sound insulation over the coupe. I bought mine through 034Motorsports who had a great price at the time
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