my car is bone stock at this point. I'm trying to set up a good suspension budget for this year at about 4k and it looks like that will be do able, those spl bushings and links are expensive! but i'm sure worth the price. Do you use any of those?

If you haven't heavily modified the car (reducing weight) just go with the recommended spring rates. Going with anything else requires corner weighting and calculations to come up with the proper spring rates, and that is probably more involved than you want to get at this point. You can swap the springs later for around 200 a set.

yeah i looked into a forum on the rotors, it looks like 2 piece rotors are the way to go if i want to change them at all. I'll just wait till my stock ones wear down to go that route. i have the sport package so my calipers should be good. Looking at the 510's they give you customization on the swift springs. What sort of stifness and length should i follow? i saw they had a chart for spring rates but idk if those are stock values

SS brake lines are something you can do if you have the cash. The rubber line is only about 5 or 6 inches long on our cars, so I don't personally feel it's worth it if you are only doing light tracking until it's time to actually replace them. Up to you though. Rotors or calipers.. I mean, if you have good rotors, you should be fine. Calipers.. well if you're sport package, you'll be fine. If not, you'll still be fine, you'll just outgrow your brakes after a few sessions.

and quick question on the SS brake lines, are they completely necessary? i would assume that the rubber lines expand when they heat up leaving them less responsive? takes away the squish when you break. So my car should be track ready with the sway bars, linkage, coilovers, oil cooler, cooling duct and track pads. I'm assuming rotors or calipers maybe? but i'm not into dropping 10 g's on a car that i won't track often initially

Pads and fluid are a MUST. A good sintered pad for the track like Carbotechs or CL Brakes RC6's. Fluid, get Motul RBF600, you won't regret it. Good choice on the Fortune Autos. 510's with the Swift upgrade will be top notch for you. You can get them rebuilt for $150 every year or two and keep them tip top.

Okay awesome thanks. Are there some other mods i should consider prior to taking it on the track also? or for when i get more serious about it? I understand an oil cooler for sure, maybe a brake cooling duct, track pads. I think the Fortune Auto 510's are what i would go for honestly, to give me a better option of making the car a permanent track car in the future but i'll keep it streetable. Thanks again

I would say that set up is not over kill at all. I don't know anything about those coil-overs other than that they are popular for the car show crowd. They're expensive enough that you can get some more track-proven units for the same or less money. Consider Fortune Auto 510 or 500's or BC Racing ER coil-overs. The Fortune Auto's in particular are a popular part for real race teams (albeit with customizations). Myself, I'm looking at K-Sport RR types, but they're super, super stiff with very little travel, probably not nice on the street!

The BC ER's are true type, meaning you can get the adjustable mid-links from SPL and get rid of the giant aluminum bucket in the back (the rear spring perch) and get much more toe-in adjustability. That's what I would do, rather than getting those Tanabe's. Not everything from Japan is better. :P

Hey man, i've seen your build thread and postings around suspension and you seem knowledgeable on the subject. I bought my z in october and it's currently in the garage for the winter but i would love to take the car out to the track around here in michigan. I wanted some advice for someone that would like to take the car to the track once a month and really drive the car the way it was engineered to be driven. The following mods are what i've chosen thus far: Tanabe Sustec Z40 Coilovers, WL fr and rear sways, spc front and rear camber arms, maybe spl end links? (if they help much). Question is, are these mods overkill for what i would be wanting to do on the track? keep in mind i do know the prices and what i would be looking at. Thanks