Exhaust, intake, Exhaust, intake, man I'm exhausted Options

[Swifty]

I've got my car now, so I want to know which exhaust is the best, ive been looking around and I think that either Tanabe or HKS have the best looking cat backs, problem is the only manufacturer for the 6g Celi is Greddy with thier SP cat back, I'd get this but it looks kind of funny (No offense ) I mean the tip isnt the best looking and the piping doesnt look much wider or free'er flowing than stock so I was wondering:
1. Can I someone plz post pics of an installed Greddy SP
2. Would the 5g ST-185 HKS Hi-power cat back exhaust be able to be put on a 6g GT, and would this be a good idea?
3. If I were to get a universal Tanabe medallion exhaust where should I go for the piping?
4. Are there any other exhaust manufacturers for the 6g
-----------------------------------------------------------------------------------------------------------------------------------------------------As for the intake part I'm strongly considering the injen one for the 6g, but was wondering if it was a cold air intake, even if its not does the heat shield help against the hot engine air, if not are there any good CAI for our gen cars? Also I've hears that the Blitz filter is one of the best out there, if this is true how would I make it into a CAI?
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Thanks in advance for any info