I took my car on this large sweeping turn a lot faster today to see how flat I would be through it.. and wow, big difference from stock. Sounds like all the sway options are probably worth it.

^ agreed. I think I'm going to go with the hotchkis for the adjustable rear. What about understeer guys? Anything on that?

Has anyone noticed any negative effects on the Z with aftermarket swaybars (besides increased ride rigidity that is)? I'm just wondering because I know for a Mk IV jetta (after much trial and error in the community) it's actually more beneficial to totally take out the front sway bar when coilovers or much stiffer/lower suspension is put on. The car overall feels better and it actually helps with turn in response and mid corner grip. I know it's comparing apples to oranges but I have little to no experience with other cars and swaybars so I just thought I'd ask.

A MK4 Jetta is a completely different chassis situation. Front wheel drive and front weight bias has completely different requirements. I have extensive experience with this chassis on the Audi TT and trust me, other than AutoX stuff, removing the front bar is not the best for precise handling. It is better to reduce understeer by Adding a rear bar (which it does not have stock). Bars reduce body roll. Taking the front one off a MK4 chassis only works with lowered and stiffer springs to control the roll.

The Z, being rear wheel drive with a better weight balance front to rear requires bars on both ends for proper balance of the chassis. We do not have a front heavy understeer problem with this car. It is already well balanced and relatively neutral. The Stillen's (or Nismos, or Hotchkiss) just make a good thing better.

Ok thanks for the info. Yeah as I said I've only had experience with mk IV jettas when it comes to sway bars and yes I meant mostly for auto cross. I knew it's a totally different beast (RWD vs FWD, totally different chassis, meant to be an everyday car vs meant to be a sports car from the factory, etc.) Good to know sway bars add some positive stiffing to the Z's chassis.