I would say there are two main reasons to go aftermarket.
1) Adjustable - If you are skilled, you can adjust the suspension to the track and weather conditions. I basically have 2 settings for my Ohlin's (Road & Track). Once I get to the track, I adjust them fairly easily, then readjust to go home. One time I forgot to adjust and I noted the different ride the INSTANTLY in the first corner. More body roll, softer compression, etc... I wouldn't get them to adjust to a canyon road vs standard street road. I just don't think there is enough predictability in most canyons roads to "optimize" the suspension.
2) Ability to curb hop - This is where I think most track drivers will notice the biggest difference. The stock race suspension is not bad, but it tends to upset the car more than it could when you take a curb. My experience is that the aftermarket are much better about taking a curb without upsetting the balance of the car that much.
Frankly, I would do a good alignment (Jamie's Road or Intermediate blocks) with the stock suspension and call it "good" for mountain roads and very light track use. The biggest gains for track fun are 1) Alignment 2) Rudi's rear bearings and 3) Better seat support (CGLock). Until you get much more track serious, then 4) suspension and adjustable swaybars 5) Race harness and race seat.
2015 Alfa Rosso Coupe (SE) -
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EuroCompulsion V1 AIS | Pogea Silicone | Capristo Exhaust (Valved) |
Ohlin 2-way | S111 Swaybars & endlinks | Girodisc Rotors | PFC-11 pads | Rudi's UniBalls (Rear) |
S111 Harness Bar | Technocaft T2S Seats | Schroth PROFI II 6-point |
OZ ALLEGGERITA 17/18 - Falken RT615K+ | OEM 18/19 - Pirelli PZero | XPEL Ultimate (Full)