Think I'll spring for F/R alignment kit
 

So, I have my 2010 G37xS sedan on Swift springs, and I have gotten away with the OEM 18" wheels/tires and spacers without any alignment kit whatsoever. I do notice with my +30 offset summer wheels (19x8.5) that the front camber is a bit off, just with a visual. It's been a few years since I installed the Swift springs and had an alignment. They were able to get things close enough within spec (or barely out of it) where my tires have been showing no unusual wear. I know stock adjustments are very limited for both front and rear, and I don't want to be eating through summer tires for the few months out of the year I'd be riding on them in Chicago.

So I am assuming all I'll need are the SPC front arms (any more knocking noises coming from these? I knew there were issues early on.).

What about the rear? SPL eccentric lockout kit and SPC rear camber arms?

Just trying to budget and get all my ducks lined up. Any longevity feedback?

Thanks everyone. :)

I've had my SPC F&R kit for about 4 years and had my alignment checked again last month and the readings are still holding true. SPLs are a nice beefy rear setup but SPCs should be fine unless you're going to be tracking your car regularly. I was actually surprised that the alignment didn't change because I've hit some pretty nasty potholes etc over that time. If you're already real close to spec you may even consider going w/ just the rear camber/toe bolt kit (you'd need two kits for the back) rather than the camber arm & toe bolt. Here's the bolt kit
SPC Performance Camber/Toe Cam Bolt Kit; Pair, Reqr's 1 per Wheel INFINITI G35

Nice. Ty for the info! Appreciated!