More boost
 

How much boost can a stock 1.8t hold before parts need to be upgraded??

About 350hp and then you'll need rods. As for other stuff, you need a new DV if you chip the car, and other supporting mods as the power goes up. What car do you have? Read the sticky FAQ posts in the B5 section for a lot of good upgrade info.

I have a 1.8t B6 quattro sadly its an auto

You can upgrade the chip and DV for the first part. Get a drop-in K&N or other filter, downpipe (if you don't have emissions), catback exhaust, upgraded intercooler, upgraded turbo inlet pipe and throttle body pipe, then reflash the ECU again for a Stage II tune along with bigger injectors. Those should hold you over for awhile.

Jeremy's not wrong persay.... But stock program can be tricked via diode mod to 14-18 psi. After that you'll want to tune the car(22-25) psi. at this point you'll definitely want to upgrade your dv.

If you want the car to sound breath better do the airbox mod. I would recommend sticking w/ the paper filter or get a dry filter. If you want the turbo to spool better free up power, get at least a test pipe. If you want more groan do exhaust. Once you need to replace you tip then get a tip, I think mike hood ran a stock tip over 200whp on his k03.

After all that and you want more power you gotta ask do I really Want to spend more on this car or get a manual trans car or do a man swap.

Like said read/ research.

Sweet sounds good guys thanks. That will most likely be the stopping point cause I want a manual car again