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Pops & bangs is w*nk IMO. Not convinced by the long term effects of running such a map either personally.
Straight through system with de cat would sound like amplified thunder. Would be my choice.
Naturally will use more fuel upon start up when cold. But cold air is more efficient, so depending on the journeys you do, it would/should make little difference IMO.
Depends what you want from it mate. No doubt the 197's as an all round car is better. But if you do a lot of track days & it's just a weekend screamer, i'd keep what you've got as you've put money in it.