Hello all. Just got my first modded Jetta and need some help on an O2 error and other noob stuff. The previous owner said he got the CEL once he put the 3" DP on. I'm assuming you have to put an "antifouler" on the O2 like we had to do with the B5 S4's?

Opinions on short shifters, cat-backs, ect for a K04 1.8 would be helpful. Info on boost limits with stock fueling and such would be greatly appreciated.

Specs that I know from the previous owner. All work is pretty recent too. K04 w/ Upsolute ECU flash (can't get on Upsolute's site to see what their tuning is), 3" downpipe, high flow cat, still stock catback, K&N drop in, cold air ducting to stock airbox, Forge diverter and turbo inlet, stock IC and piping, stock fueling.

This car's got great potential and is a blast, though it is definately not my S4. :-)

Thanks guys