I was saving up for getting the APR tune for my 2003 RS6, only to find out that APR has discontinued their tuneup (ECU+TCU) for C5 RS6.
What other tune up options should I consider. On this forum I have learned Revo runs lean and can cause problems in hotter weather. I am in Texas so weather can play into it. Is GIAC a good option?

Are there non official APR options? folks copying and flashing from their ECU to others?