i have been doing a lot of reading and phoning to find whats available for non-track improvements - i am looking from the road car angle that you would take your wife/kids out in, rather than the bone-shaking track demon mods and here's a summary: the standard /SE suspension seems ok but the damping isnt great and the springs and a little hard, and it sits too high with too much understeer. springs sport is -15mm compared to standard s-line is -25mm S3 is -35mm aftermarket springs - millions to choose from but main one are: h&r -35mm eibach sportline -30mm eibach pro kit -45-50 weitec -40 kw -40 if you go lower you get more static negative camber (good) but lose camber gain in roll, so that the -45 to 50mm drop seems to have used up all the negative camber available at the front. also, the pro kit seems to rub/catch occasionally particularly with wider wheels or lower offset wheels popular opinion seems to favour the eibach sportline or h&r dampers loads to choose from, some adjustable. i have had adjustables in the past and always had them left at the factory default, or fiddled endlessly rather than driving the car, so i was looking for good but fixed damping for road use to fit and forget. koni, weitec, h&r etc etc popular option from people who have tried favoured the koni fsd which give a great quality of ride with good damping and handling when needed the fsd dampers have a small assist spring inside that tends to push them out which can mean a car doesnt lower quite as much as expected (this is only a few mm so doesnt seem to be particularly important) they are highly rated when used in combination with the eibach sportline -30mm springs. ARBs increasing the thickness of an arb increases roll resisance in proportion to the 4th power of the diameter, so small changes make a big difference. audis are set to understeer by design, and increasing the proportional thickness of the rear with help to reduce understeer and eventually provoke lift-off oversteer (controllable with the ESP anyway) an increase of front roll stiffness will reduce roll, promote stability and turn-in but the rear needs to be increased by a higher factor - probably about 1.5 to 1.8 times the front increase my sportback 2.0tdi comes with front 21.7mm rear 20.7 fr =increase in front stiffness, rr = increase in rear ratio, r:f = rear to front relative increase options include: make front rear fr rr r:f ratio h&r 1 26 22 2.06 1.27 0.6 - more understeer h&r2 28 24 2.77 1.8 0.65 neuspeed 25 25 1.76 2.13 1.21 good choice but £400 kw /eibach 26 2 2.06 1.52 0.73 golf r32 front 23.6 1.4 1k0 411 303AL only £75 golf front neuspeed r 23.6 25 1.4 2.13 1.52 possibly the best choice negative camber more negative camber at the front will improve turn-in and increase front end grip and reduce understeer dramatically. -1.5deg to -1.75 deg is fantastic and wont kill your tyres if the tracking is ok. the rear needs less, probably about -1deg each side. the rear is factory adjustable lowering the car will give you some negative camber, but too low uses up the gain in negative camber in roll. 2 options to increase front negative camber more: 1) morego do altered bottom suspension arms - -1.5 to -1.76 deg on an exchange basis, fitted at £495 for the golf 5, and these fit the a3 2) adjustable top mounts from k-mac give adjustable camber and caster and can give upto -3mm negative camber, they can be adjusted on-car easily. they cost about £160 delivered from the australian manufacturer and simply replace the factory top swivel for standard springs/dampers or coilovers. so after all this, my SE now has: eibach -30mm springs koni fsd dampers neuspeed ARBs front and rear, soft setting at front, stiffest rear k-mac adjustable plates -1.75deg front, -1 at rear the suspension is more comfortable than SE on potholes and broken tarmac, far better handling at high and low speed, better turn-in, the understeer has gone and it looks a lot better stance without being too low.