Okay, I have a stock A4 1.8TQM Avant and I was thinking about getting a chipped ECU... Which one do I go with? The only ECU's that I find are S4 ECU's...?
I would rather buy an ECU already chipped so I can return the car to stock if I ever decide to sell it.

Any input would be greatly appreciated...

 

Just chip your current ecu and then you can sell it or just get rid of it with a chip in the future. Its not going to hurt resale

 

I've got a spare ECU chipped by InMotion. My bro-in-law had it on his '98 1.8T and gave it to me when he sold it (with the stock ECU). I'm still using my original ECU which was already chipped when I bought it. A company down in FL called "TAP Tuning" did it back in '99; outta business now I think but the ECU works perfect, no need for the InMotion-tuned one. Contact me if you're interested in buying it.

 

I would chip it with GIAC, most aggressive chip for the B5's.