user 83838290

nice job, I want to do the same before I do a custom remap, just to be on the safe side. did you by any chance find out if they also fit an 06 CT-S?

Cole

Sould be the exact same set up. No physical differences in the boost system from a CTT to CTTs (other than the intercoolers). Just the software, which is what you would be replacing anyway.

hahnmgh63

I had a pair of the APR R1's on my RS6 and they made a terrible honking sound on part throttle. APR said they had a mod to them so I sent them back and when I re-installed them they were still the same so I pulled them back off and just re-installed new OEM Bosch valves.

Cole

These seem fine so far. They are burried much further down in the engine than the Audi set up. So maybe that masks the sound.

hahnmgh63

Maybe I'll try the pair I have on my '06 CTTS as the OEM's are probably due for a change at the 5yr mark.

bigbuzuki

Cole, have the diverter valves made any difference to the pressure indicated on the boost gauge.
Are you hitting 0.7-0.8?

Cole

My boot gauge pins the needle.

bigbuzuki

How was the boost before the tune / diverter valves?

Cole

Much less dramatic than it is now. It would not oin the gauge, just up to the last mark.