Firstly do you know why you want/need bigger tyres? this may help with what sort of height upgrade you require. if your only going for looks/better traction, why not look at a set of good all terrains and some decent offset'd wheels rather then larger?
I'd just spring over it and add some longer shocks... Or RUF with OME 2" rear springs and shocks to suit, or just body lift it 2" before i bough any off the shelf kits... there are many ways to lift a car, however non of them may suit your needs or how you drive. you need to figure out how/where your susspension is failing YOU before anyone can tell you how to fix it.
As for the snorkel, they arent designed for 'performance' they are designed to keep water from entering your intake. however, the G13's dont tend to like water much (I found this out a few times haha) The dizzy/carby/coil are already highly set on a Sierra, so I personally think youd be wasting money getting one, especially if your not doing anything serious.
And as for the exhaust, I went with a 1.5" when I upgraded the carby/intake, and it was pretty nice to drive, no gain in power but it did allow it to rev out smother. 2" is too big IMO..
As the other boys said, youre better off doing a search, reading through some build threads is the best method, then have another search and only then, if you have any questions, post your question 
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