My question to you guys is ... Am I crazy?
I work out of a shop that specializes in 240's. We dont bother building KA motors but rather swap them out for the sr20det's. The sr's are a much better motor to build up then the KA for several reasons but I wont go into that.
I think you may be taking advice from the wrong people as to what you should do with that motor. Most of the people who build up KA motors for thier 240's are kids that dont have the money for an sr swap. The KA motor was never designed for performance and was only offered in the states as a replacement engine for the sr because of smog.
The picture of the turbo manifold is china made and cracks/breaks very often. The fit is poor and they usually leak and come loose because the flanges are not machined.
Yes, you will get more hp if you put a turbo, but any motor with a turbo will make more power.
Do I think your crazy? Yes, I do think your crazy for listening to internet kids that dont really know what they are talking about or are just trying to sell you some crappy parts. Most of the time, when people buy stuff, they sware by it because they need to feel that thier purchase was justified and they made the right choice.
Dont take advice from the people that have only owned or tried just one setup, or the guys selling you the parts because thier opinions will always be biased towards what they sell or what they have.