Based on my experience modding a 335 and a 135 I have found this:
Street Driving and not in any order
- Matched shocks / springs or coil overs - biggest bang for the buck. Now some serious time and research went into your stock suspension. Don't go with some half-assed makeshift combo like HR springs and PS shocks. There is so much more to suspension then that. Get a professionally matched set up or a good set of coil overs.
- Camber Plates, really improve handling and will let you fit bigger rubber up front. Worth every penny.
- Proper size sway bar links. Do this before you buy aftermarket sway bars
- Aftermarket sway bar bushings. A good alternative to new sway bars (I'm not a fan of huge sway bars)
- M3 Tensioner/Wishbone. Increase camber but most importantly really improve steering feel. No more steering slop.
- Rear Subframe bushings. On the street not a big deal. On the track or Auto-X sloppy bushings are the cause of more spin outs then people realize. Top notch Coil Overs are wasted without them.
- Sway bars - too hyped. There is a distinct difference between real mechanical grip and less sway. Only AFTER you have dialed in the rest of your suspension should you experiment with this.
- Rear M3 bits. Less deflection, but not worth it unless you are really going high end everywhere else.
- LSD. By far my favorite mod.
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