HFCs probably get you best bang for your buck performance. You could get test pipes, but you'd probably fail emissions.

Upgraded Intakes will result in +10-15hp.

The SAFE route is to get K&N Drop In Filters & Post MAF Tubes = $180
or
Used Stillen G3- $350

CAI is a great start. Pretty safe. Reasonable bang for the buck. If you have much experience working on cars, it's an easy DIY (in most cases; some require body mods). If that's the only mod you make, you may not need to re-tune.

Exhaust is another good one. Can get pricey and you need a lift or good ramps to install. If you get CAI and exhaust together, will probably require a re-tune.

A supercharger is expensive to install. Since your asking, it's probably not a job you could DIY. Will definitely need a re-tune. Not really unsafe, but you will be putting a lot of extra stress on the drivetrain, so things will break more often. May also require other mods/upgrades, eg, exhaust and injectors. The cost gets high quickly, but probably your best bet for horsepower if you have deep pockets.

A short shifter will only help if you know how to use it. For most DDs the only benefit is bragging rights. If you plan on needing faster shifts, maybe you should jump straight to a supercharger and hipo exhaust.

YMMV

Either Stillen G3 intake OR HFCs... Now safest might be intake because you can't ruin anything really...
And unless you're getting quality Berks, you might not squeeze the most power out...
And you'll have to deal with the demon bolt and the risk of breaking the O2 sensors.

I'd go intake, then exhaust, then HFCs if you want it louder and want to get a bit more power out

Don't do a short shifter. With the rate of synchro failures on these transmissions i wouldn't chance giving the dealer a reason not to cover that. Plus most short shifters are so tight that the shorter throw is negated by the increased effort

Driver training.

what is a "speed shifter"?

That's not really safe tho.:icon17:

:iagree:. Intake, then exhaust and HFC.

Sound like our 7 speed auto.?

GTR start button. Instant gain of 213 horsepower for $40.

clear bra - tint - CAI - spacers/wheels/springs - sway bars -exhaust - tune - interior and atheistic mods

That's the order I'm shooting for.
I priced out each and budgeted so I know exactly when I'm getting them done also. I may move onto bodykits/etc after all of these, but I don't want to show much that my car's different from other Z's until it performs much different.

And it will start up your car 10x faster then the rest of us don't do this mod.