Well...
Good Ideas: If its been awhile since you last did it, while you have the rotors and all that off, you should repack your wheel bearings, flush your brake and clutch lines since they will be off (I'm sure you already were), and if you want a big job... replace your bushings on all your suspension. Check the torque on all your chassis bolts and adjust the clearence on your valve heads. Depending on your miles an M/T gear oil change and LSD Gear oil change never hurts.Torque all of your seat and safety belt bolts, mine were ridiculously loose when I decided to check them.
Upgrades:
Change out your shocks for some more responsive, not lower(because of TEMS), race shocks... like me =b. You'll appreciate the ride and handling difference if you buy good stuff.
Metal Head Gasket and ARP Head Studs torqued good and high. Safer if you up your boost with the next mod.
Manual or electric boost controller. Pretty obvious what this is for *makes turbo whistling noise*
If you decide to pull the head gasket you might as well have the head polished. More Air flow.
And if your gonna do all that ridiculous shit it might be time for an aftermarket EMS or at least AFR meter so you don't melt your block. But most of that stuff you can do safely without. I assume your going to get an Aftermarket EMS anways with the 550s to take full advantage. There is other stuff you could have done... but it gets more difficult from here.
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