2nd hand but good condition Brembo brake kit from STi will cost you around $3k complete usually, give or take a bit for fitting and if you can get a good deal or sell your current setup..

I'd be getting a turbo-cat exhaust and a tune first up as that will give you a decent improvement in performance... then look at the Brembo brake setup(may need to replace your wheels as well with this as the stocker's won't fit over the top of the Brembo's...

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'04 E46 S/C M3 Coupe