I agree insite. It's not just cheaper to drop in a 3.4 or 3.6, but you also get OEM reliability. Still there's more power potential by going to forced induction.
I said it was fun stuff to dream about because it's really a dream for someone like me. See I live in the communist state of California. Here you could do an engine swap (and then get it approved), but a custom turbo setup would be completely illegal. 
Right, I understand the cooling effect of nitrous, which is why some folks use it to cool their intercoolers... The point is that A. Graham Bell claims a stock 10.2:1 CR engine can maybe do 5 psi boost with a very efficient intercooler. The original question here was what can a Boxster do on nitrous. Based on Bell's chart I'd estimate that our 11:1 CR engine could probably handle 3 psi with a cool charge. What would be the HP shot equivalent in nitrous of a 3 psi boost from a turbo? Hmmm... maybe around 40 HP or so is what I'd guess.
Pics of that intercooler install would be "cool". 
Kirk
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2000 Boxster S - Gemballa body kit, GT3 front bumper, JRZ coilovers, lower stress bars
2003 911 Carrera 4S - TechArt body kit, TechArt coilovers, HRE wheels
1986 911 Carrera Targa - 3.2L, Euro pistons, 964 cams, steel slant nose widebody
1975 911S Targa - undergoing a full restoration and engine rebuild
Also In The Garage - '66 912, '69 912, '72 914 Chalon wide body, '73 914
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