^ Man, that's hard to read there bro. I think just about all your questions would be answered by using the "search" function here and then come back with follow-up.
Sounds like you are heading off in the wrong direction with your mods. The rear motor mount is a typical early mod and a good one. But all that other stuff would come very much later, Iif ever, MHO, long after you have addressed the more basic and usual upgrades.
[Sorry mods for taking us off topic for a moment]
Short answer. Just get a rear motor mount.
Longer answer: If your car has the stock intake you need good SRI or CAI intake (search). You'll want to consider a possible tuning option such at Hypertech or Cobb AP, (search) and you'll want to look at addressing where the actual restriction is in your exhaust - the downpipe and race pipe and NOT the catback (search)
The stock CBE flows well in excess of the maximum flow rate of the stock turbo on this car. It will keep up with just about every mod you throw at this car short of a bigger turbo. A change in CBE is only going to change the sound.
And for gosh sakes, before you start modding, get some way to monitor your boost level and if possible air to fuel ratios and fuel pressure before you get into trouble and add your name to the blown engine list. At least a boost gauge. Maybe Dash Hawk or other scan tool and learn how to use it.
And one of my personal peeves: Don't go out and buy a big flashy BOV and run vent to atmosphere. This is a MAF sensor controlled engine. Farting air to atmosphere just screws up the tuning and usually makes the engine run roughly. That air released by the valve has already been metered and the fuel is expecting to mix with it. It needs to go back into the intake at a location behind (benind) MAF sensor. You must run recirc. I just can't make the stock bpv leak or malfunction in any way, not even at over 53,000 very aggressively driven miles. It flat works.
Search is your friend. Do some reading. Welcome to the forum. You're gonna love your little hot wagon. Get the SURE mount and be done with that part of your mods.