I did high flow cats and a Cat-back in my garage with the Z up on jack stands. It was a little cramped, but it saved me a lot of cash. I also installed my own cold air intake, throttle bodies and upper intake manifold. All of which were pretty straightforward. If you have any wrenching skills and can follow a DIY, you should be good to go. Just do a search on here and on youtube for the best DIY for what your doing.
Headers can be done at home, but it's a tough job and from what I remember takes about 8 hours to do both, but I may be a little off on that. It's been a while since I've looked in to them.
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~Rob 
-DD Air Guide, Stillen G3 CAIs, 63mm Throttle Bodies, Motordyne M370, Berk HFCs, FI TDX CBE (non-res, CF), Sprint booster v3, Ecutek Dyno Tuned, and the list goes on...
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