Corksport turbo as stock replacement

[Fstrnyou]

I believe the only "extra" mod for the S3 vs the CST4 is the intake.
Since you "just installed" a CS TIP, you may be able to sell it as almost new and put that towards an intake for the S3. If you would prefer the S3 over the CST4.

I've have put almost 2 years of service on my CST4 and was pushing 26-28PSI for the last 6 months.

[Jeff23spl]

You would need a tune and a compatible intake but everything else really depend on how far you want to push the new turbo. You could even run a 600hp turbo dialed down to 350 but you would'nt like the useless added lag that came with it.
I think you should consider a BNR-s3/CST4 and just tune it for the mods you have and this way, it will last longer than a tiny one pushed beyond the limits like the k04...

[AntimonyER]

I just swapped my smoking k04 for a CST4. I also installed a corksport catted downpipe at the same time. (I already had an intake) I'm still early in the tuning process (I purchased a freektune) but at higher rpms it's quite noticeable. But it also is a bit sluggish compared to the k04 in the 2500-3000 range. Hopefully this gets better as the e-tune progresses (we are starting very conservative due to high mileage of my car) just my initial observations.

[MSMS3]

Originally Posted by AntimonyER I just swapped my smoking k04 for a CST4. I also installed a corksport catted downpipe at the same time. (I already had an intake) I'm still early in the tuning process (I purchased a freektune) but at higher rpms it's quite noticeable. But it also is a bit sluggish compared to the k04 in the 2500-3000 range. Hopefully this gets better as the e-tune progresses (we are starting very conservative due to high mileage of my car) just my initial observations.

You’ll make substantially more power than the K04 when the tuning is completed, but you are not going to get the responsiveness in the low rpm range that the K04 had. It’s a trade off. The larger wheels on both the compressor and impeller side make more power, but spool will be slower. The big downpipe will not just make more power, it may help with spool sluggishness, since it will offer less downstream exhaust restriction to flow.

[Fstrnyou]

I have a JBR silicone intake, JBR EGR delete, and JBR EBCS. No issues.