This is a great thread, Iâm heart set on doing the K04 conversion on my DTM. One thing is the K04 flange on the De-cat pipe. Where did you buy the flange? I asked RAI and they replied saying they would need to sell me a turbo before they could make the test pipe with the S3 flange on it? Did you buy the stock K03 pipe and then fabricate a custom flange yourself? I think if I can overcome the flange hurdle and the diverter relocation the swap should be a simple enough job? Any advice appreciated!