I'm running an EK9 b-pipe and EK9 black box on my EK4. Yeah the EK9 cat is a bit shorter then the EK4 cat so I had problem with the fitment, as the EK9 exhaust I got didn't come with the cat. I've removed my EK4 cat and got a resonator pipe welded on to compensate for the length difference...
Yep can confirm the sump bolt is the longer one and the tranny is the short one, as i just did both engine and gearbox oil last weekend. I have a Blox set which is the same as most magnetic bolt out there.