Originally Posted by tosh

I didn’t think the rear sunroof drain pipes would even be able to get into the rear part of the sills as even if they were leaking it would either stain the headliner at the joint where the pipe meets the sunroof tray drain at the rear, or in the boot area where it exits by the rear boot vents useless the pipe was split within the C pillars.

The front sunroof drains are a different matter though as they do drain into the front part of the sills and then drain out of the sill drain slots, and depending on if you car is parked facing up hill which will allow the water that gets into the sill to run to the back end of the sill and rot it away at that point, when I repaired my footwell rust I cut the drivers floor pan out Just above the front jacking points and noticed that rain also leaks into them as there’s a small slot between the sill and the inside of the jacking points (I put a photo on here somewhere showing this point but can’t find it)

have heard that some have extended the front drains within the a pillar and diverted them into the front wheel arch area behind the wheel arch liners.

Hope all this made sense as I’ve had several beers in the garden