Downpipe
If you want to retain your stock catback, get the one with a reducer, the part number ends in "R."
If not, you really don't need a 3.0 DP; the power gains are not that significant over a 2.5, and most people report losing a little low-end torque with the 3.0 You can try searching the 1.8T forum on vwvortex for more info, if you haven't already. With a DP that size, you make fit issues more likely (the DP rubbing), and I would think CELs may be more likely.
If you need a 3.0, you could try GHL's website too, but I'm not sure there are many places that offer one in that diameter.
Just my 2 cents from someone who's been down the same road...
Next month will be ( I hope about 240 hp ) - custom downpipe 2.5" or 3", custom 2.5" exhaust, injectors, Forge Diverter Valve, electronics...
Then in near future, I will install bigger turbo...



