99 Jetta
 

my buddy just bought one with 160,000 miles on it and runs awsome.. the only thing is i don't know anything about them and he wants to give it a little more pep so where do we start...

fratelli bosio injectors

http://www.kermatdi.com/servlet/StoreFront

There's all sorts of stuff out there! Injectors, chips, air intakes. I don't think your going to see much of, or any gain out of any of the aftermarket intakes out there. VW has there fuel/air dialed in!

I would check all the breather hoses, intake and egr valve. With that kinda mileage I'm sure there pretty well carbon caked. A couple of other things. Find someone with a scan tool or VAGCOM to check the MAF sensor readings. They have a tendency to fail. Also check the wastegate actuator on the turbo. They sit on the bottom side of the turbo and they have a tendency to get dirt/grime build up from the road and causes them to stick. If it's clean try and manufacture a shield to go around it to keep it clean and functioning.

Just check'n/cleaning some of these things, you may find some lost power! Hope this helps!

AFE makes a great intake - oh and they work very well by the way. On the 99 you won't find the enviro stuff unless it was bought in or sold to CA. back then.

MAF's are easy to clean and can be replaced just as easily. The cost varies dramatically though so be careful.

Otherwise, run some treatment through the fuel and see what that does for you. The injectors and turbos make great upgrades on these cars but be careful about running hot and or building too much boost as the block will go tits up.

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