Cheers Wil much appreciated for that excellent advice, explained a few things more clearly.

Wouldnt be occasional blasts, would like all round performance.

S1rst M3 is not an option. 1. I personally dont rate them
2. They are too common now
& 3. A few mates already have M3's

NIL: I know full well, if the cossie was the power im thinking about it would eat the Z4 for breakfast. This is my problem.


Maybe after the advice, i could stregthen up my engine as its only just been built and get a good 350 ish maybe a bit more with a tweak here and there and just make sure the clutch, breaks, diffs, TCA's etc are all done too..

So lets say i go for 330-350 (from past knowledge that would set me in around £1000.

Then thats would leave £9k for the rest.
Clutch
Brakes
Adjustable TCA (which i wanted anyway)
Rear Beam
Maybe 909 diffs (dependent on budget left)
or just rebuilt and the stretghning plates.
BD Cams
500 intercooler / Rad

&

B&M quickshift after all that.
but ive prob missed a few things.

What do you guys reckon on that?