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what i did first was switch out the gears. I have an A6 and went with 3.15 and could have gone 3.42. this way i was able to continue to have engine warranty but got a real SOTP change. I also did the A6 tune. As for 6 speed / clutch there are some great gear sets out there for a very affordable price.
I then went LG long tubes and LG cats with stock exhaust with a engine tune, no drone and a great sound. this is also very reasonable way to get things happening. Now the engine has been opened up and that really has made this fun but more expensive.
How does having 3.15's vs 3.42's allow you to keep your warranty? I have 3.15's