Just take the valve out, that's free and easily reversible if you don't like it. One I didn't get around to. Taking the assistor spring off is worthwhile but the best and easiest I found was a bump stop for the clutch pedal. About £10ish on ebay, they reduce the pointless travel of the pedal. For me it also mean't getting a more comfortable position of the seat whilst still being able to fully depress the pedal. I'd also recommend adding an Audi short shift from a TT/S3.