Something about my Q4 has bugged me for quite a while now, infact since I had the majority of work done on it and had the chip written on a rolling road.

Peak power arrives really quite low down, 5400rpm or there abouts. Now the car was running without Cats, and with a different (larger) turbo. Works well around town, but lacks top end power and grunt on track etc.

Anyone got any ideas about how to address this and open up the top end a bit more.

Thanks.