got 2005 jetta gli built july 04 what mk is car
What is mk?
It's a MK5 - http://www.vwforum.com/forums/f29/
I just bought it and been looking at after market performance parts and some say mkv or something else
The OP means "Mark" (MK)....The below is from Wikipedia on the VW Jetta...you have the Mark 5: The fifth generation debuted at the Los Angeles Auto Show on 5 January 2005. It was only the second Volkswagen product to make its world debut at a U.S. Auto show (the other being the New Beetle). Furthermore, the Mark 5 saloon/sedan went on sale in the USA prior to any other country, reflecting the importance of the car in that market for Volkswagen
Check in with other owners on the two forums I listed. They can tell you what works best and what is a scam.
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