same problem with mine. If i remeber correctly though, the back sunroof drains go by the back windshield, were the trim is on the back. thier is actully trim covering the drain exit. However, im almost positive water pouring is do to me needing a new sunroof seal. not to fun going threw the auto wash and im sure u know what i mean by that

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1983 Euro 240D 277K
2016 Mazda 6
Coming Soon, 2013 Mercedes E350 Bluetec
Formers:
2012- Mazda 3
2007 Outlander- complete pile
1995 E300 Diesel 208K
2007 VW Passat 2.0T 63K SOLD
2003 Jaguar X-type 3.0 Sport Sold 04/11 w/88K
2009 Lexus RX350 9061 miles. Sold 04/09
2008 Mitsubishi Lancer GTS:Totaled Sept.,09 @ 24,000
2003 Infiniti I35 58K Sold
1984 300 turbo diesel 222K