well the topic says it all

i have seen this website would a ko3s from a gti fit an audi tt
http://www.kineticmotorsport.com/cat...ERS-143-1.html

and does a k04-001 fit without modifications. my turbo is leaking badly and really dont want to spend a lot of money i am content with the power my already has.

 

Both will fit...K03s might be both oil/water cooled but you should be fine with just plugging the water lines if yours doesn't have coolant lines running to the turbo.

 

which would you recommend ko3s or ko4 and which ko4 would fit without any problems or extra expense that i dont need right now and are they noticeable gains my car already has mostly all the boltons except for w/m and fmic

 

Just get a used ko3s from the vortex classifieds. They are about $150 and more often than not be good for another 30-50k miles. If not, the ko4-001 is the one you want. It has a larger turbine, but smaller compressor than the ko3s and is rated all of 5hp more