Ok, i have another issue i have to deal with, the S4 has 120k, APR chip, catback, and many other little engine mods on it but stlll has the original turbos. I think the seals are going bad on the turbos because i smell oil everytime the car hits boost. My question is should just replace the K03's, upgrade to K04's, or do a custom set up, maybe even a big single turbo.

IDEAS!!!!!

Thanks
David