Depends how far you want to go and how you find stock setup ? Msport kits isn't bad if in good health once you sort rear pogo with shorter bumpstops and add some camber with m3 front arms and my Camber plates, also rear subframe inserts helps keep rear in check...... but if its needing a refresh or you want to upgrade more then for a sensible budget I would go with koni sport adjustable dampers, msport or eibach pro springs, BMWP bumpstops front and rear (or koni shorter rear for extra ride comfort) as per my suspension quest as link in signature below
if you have larger budget get the Ohlins coilovers as I fitted to my 135i, not as comfy as Koni setup but still decent enough and much better body control when pushing on.
Stage1 camber plates will probably be enough for road use/odd trackday when coupled with M3 arms, stage2 plates with M3 arms will give anything from -2.5 to -3 camber which can be a bit much for normal road use although many do run that much.
Thanks for the info,
I could talk endlessly about suspension setup that is off topic. so shall take that discussion to the link in your signature.
Don't intend in using M3 arms as would rather have monoball/very stiff bushings in them.
I think stage 2 will give roughly -2 camber without m3 arms?
sounds sensible camber value to me.
-2.5/3 camber I think is just too much and really, you need to be tracking the car regularly on slicks.
Just looking at BTCC, front camber does not look much more than 3 degrees.
careful with bump stop tuning, cutting them increases bump travel, extreme reduction could be too much for your brake lines.
Can you PM me a cost for a front pair of stage 2 and 1. Will continue to think about which one to go for.