https://www.audiforums.com/forum/sho...72#post1112872

I know a few of you online are in need of some 'new' ones. I'm selling a spare pair I have; pictures and details in the link. I'm not looking for a lot of money (I know what it's like to own an S4) but please make reasonable offers. I'd be more than happy to answer any questions.

-Adam

 

i myself am not interested, but how many miles are on them? ever be ran at a higher boost level?

 

I have a question about ko3s and ko4s
are any of the holes(inlets\outlets) for the compressor different size. I have new K04s in a box ,that my mechinic says looks alotta like k03s im sorry its a bit off topic but your the firstone that i have seen with pics of k03s. any help anyone can offer would be great.

 

i would measure the compressor wheels and get the exact specs.. the difference isnt tremendous... i remember when i got my RS6 turbos in and had been talking about 400 whp.. the guys at my shop were like. wow.. those look like small turbos.. but compared to the K03's they were like twice as big.. and got them installed.. and guess what.. they are RS6's!!!!

 

They do look almost exactly the same, and I'm pretty sure it's the same housings for the compressor (not sure about the turbine). But the K03's and K04's share the same journal bearings and such, but the spindles and I think the wastegates are a slightly different design.