Hi guys
I definately recommend buying the tool, as that is what makes the job so easy
Otherwise the filter is a pig to get to, and improvising will just make a bodge of it.
I paid £20 from GSF.
And after selling the R, you could sell the tool to and get your money back so its a recession proof investment
As for location, you need to jack the back of the car up and put it on axle stands. The haldex unit is located near the rear diff.
As for quotes, I've had varying quotes from £110 from Storm developments to £250 quid from VW.
Part prices are £33.35 all in for the filter and oil.
So quite a substantial saving, plus peace of mind, if you can be bothered
Heres some howto threads:
Haldex oil / Filter change http://www.kisolutionz.com/ttforum/haldexoilchange.pdf AudiWorld Tech Articles