hi I'm new to this forum even if I'm a long time reader
I own a 2001 tt with Ecu filter and exhaust and you know..
the power is never enougth..
My next step would be a bigger k24 or perhaps k24/26
any thinkin'about would be accepted..considered I use the car 50%street and 50%track with the bigger option the lag would be too much?

 

I have an X50 and the extra punch is definitely noticable. At this point, it's all about $$$. You might want to step up to zero clearance turbos. They're a jump above the K-24s. If you run the big tracks, it's worth it

 

or go for a REAL Garrett turbo and redo all your plumbing.

Garretts in KKK housing just aren't as good as full Garrett turbos. But no one here wants to believe me. Oh well.