I have no problems with my Oettinger chip over about 2000 miles now, and do not expect to get any. I have heard of relatively few complaints about Revo, especially when you consider the amount of cars running Revo software these days!! There have been a few stories floating around about catastrophic failures due to software, but I am yet to here anything substantial that links the tuning directly to the failure.
As for engine noise, the only change you'll hear will be the turbo, and it just becomes enjoyably audible, not too intrusive, but it's nice when the windows are down
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There are quite a few on the boards that have been running REVO trouble free for many many miles. As Rich said, don't go on the whole serial port programming bit until you've studied all the other tuners that are out there.
The only part that will noticeably suffer will be the clutch, but this is when doing the old traffic light grand prix. You may consider changing your brakes as well, as you'll obviously be tempted to go a hell of a lot faster everywhere, and it's advisable to stop....something that you don't do with the STD A3 brakes!!
Many times I have posted this list, but anyway just to save you a bit of time ploughing through the search engines I've put my choice of top/recognised tuners for Audi's;
APR -
www.goapr.co.uk/dealer/index.html
Revo -
www.revotechnik.com/uk/ukrevo.html
Oettinger -
www.oettinger.de or
www.roadandsport.co.uk
AMD -
www.auto-amd.com
ABT -
www.abtsportsline.co.uk/location.php3
Jabbasport -www.jabbasport.com/Audi/Jabbachips/Contact/contact.html These are what would be classed as the VAG specialists, but from what I hear Superchip don't do a bad job on the A3 1.8T.!
Isn't cut and paste great!!