I bought an 03 G35 coupe about three months ago, I'm looking to do my first big mod/upgrade with doing coilovers. I want to replace the entire suspension though, does anyone have any recommendations on all of the aftermarket brands I could get. I don't track it, just looking for something above average for performance. Thanks for reading.

 

KW version 3 coilovers are arguably the best on the market for street use, their Club Sport is excellent for track use if you ever change your mind.

These are not "true coilover" design, they utilize the factory rear spring bucket, depending on how low you want to go you will need a true coilover. I think the limit for the factory spring bucket with SPC eccentric washers while still keeping camber/toe within spec is about -1.25" drop, that's the hard limit unless you're wanting some extreme camber. Front is a little less forgiving at -1.25" and you'll be running negative camber outside of factory spec even with adjustable FUCA.

Something to seriously consider while doing these coilovers is you probably have a LOT of other components on both the front and rear suspension that need replacing, particularly things like the ball joints and compression rod. You should buy a suspension rebuild kit and change everything out at once unless you bought a garage queen that only has 50k miles or so on it. The entire suspension is definitely shot by 150k miles and most components are heavily worn by about 100k.