I’ve personally used the Borg Warner EFR series (the 6258) and the performance is incredible. I’ve never actually driven anything that has spooled so well and so quickly. It completely changes the driving characteristics with the amount of torque you get from these EFR’s.
I suppose the downside is they use dual ceramic ball bearing housings. It’s how they spool to fast. If your turbo fails, it’ll be very hard to find anyone that rebuilds them.
The heart of the CTS Turbo MK6 2.0TSI turbo upgrade kit is the Borg Warner K04-0064 turbocharger. This turbocharger is commonly used in OEM applications such as the Audi S3 available in Europe. The highlights of this Borg Warner turbocharger in our kit is the 'forged mill' compressor wheel, which brings numerous benefits to the enthusiast. The technology used in the production of these turbos provides us with a variety of benefits, reduced compressor wheel weight (faster spool), increased strength, and greater surface area of the compressor wheel. Because of the 'forged mill' technology Borg Warner can increase the effective surface area of the compressor wheel, which results in greater air flow than conventional cast compressor wheels.
I don't have the valve lift K04 but my APR K04 works great. Power and reliablility. I have it on my base 2010 TT Quattro and it is so much more fun now.
You could probably get pretty close to your goal with a Borg Warner EFR 6758.
Over the past few years, I was happy with my APR stage 3 + (GT 2871 for TT225) but finally I decided it was time for a change and more power.
You guys should really check out that R2S, it's is MONEY.
Having driven my 2001 in both modes as well, I would say the top-end gains are where I felt a change, but even then, we're not talking 5-car-lengths in races here, folks. That being said, my K04 works nicely and the torque feels a bit more broad and I am enjoying it.
IMO, the minimal increase in power is not worth it. I wasted countless time and money on this turbo and was disappointed in the end. I have since stepped up to a 28RS and am beyond please with the jump. Spool time on a small frame BT is minimal, and 300whp is plenty streetable no matter what some say. I have a k04-001. With meth, I put down a reliable 225whp all day long (and that's on the ole' heartbreak dynodynamics dyno). She holds her power, too; peaks way later in the rpm range unlike the wily k03s, yet is still @20psi when you turn the key. Is it fun..yes. Is it worth it monitarily...meh. At best, it makes for a great auto-x setup. Don't expect to do much damage beyond 3rd gear, though. I will be upgrading in the near future to a T3s60 or 28RS if that means anything to ya. I've had this setup for less than six months, and expect it gone within the year.
the ckra turbo is absolute garbage. You need to have an upgrade in mind because it's not about IF it'll fail but when. Regardless if it's stock or tuned. It just sucks.
I just replaced my 2015 TSI 1.8 after it lost all compression on #4 cylinder. It is IS20 turbo with the APR tune.
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