Hey, welcome to the cabriolet club, I am currently running a 3.0TDI A4 cab in B7 format, but I've had 2 4.2 B6 S4s in the past - good engines if you can avoid the timing belt issue, hopefully the new engine and guides will have solved this - just keep your eye on oil consumption.
I guess you know about the aux rads, DMF/Clutch and other S4 common issues...
Come over and join us in the A4 Cabriolet Club UK - don't be put off by the name, there are S4 and RS4 owners in the group but the information is huge.
Splitter - just get the MK1 Cupra R splitter from TPS, looks much better and cheaper than any other option - See pic below
Loads you can do to these things, I recently fitted Supersport seats - it was a wiring headache though!
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