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I got to compare two side by side once, the borla stingers and corsa indy's and both vettes had heads, cam, full exhuast work......
I must say the stingers blew them away, no question.
I did sit in both cars as well, and the corsa were quieter on the inside, but much more tame on the outside too. The borla's had a deeper rumble in the cabin, but not too much but sounded way mean outside the car.
I vote Borla Stingers......I'll be getting some soon myself.
I have an A4 vert and have the Corsa Touring and LOVE IT!!!! I pull up to someone at a light and they think nothing of it because it is quieter but then jump on it and it wakes people up!!
You have to take into consideration that everyone is different and you will get many different opinions!! GOOD LUCK!!!! Anything is better than stock!!!