I don't know all of the answers, but oh whell. All the guys I talk to at Edelbrock say if you have your block open, you might as well sleeve it. Golden Eagle makes some good sleeves, but really the sleeve job depends on the shop you get to do it since most sleeves are made out of the same stuff. GE sleeves are rated to 1200hp, even though that's impossible for a civic. Your stock sleeves can only handle up to 300hp.
Pistons/Rods are pretty obvious. It really depends on what kind of money you want to spend. If you get new sleeves and get the cylinders bored out, you could increase your displacement and get some more power with bigger slugs. That's what I would do if money is no option and I wanted a ton of power, but unfortunately I'm on a budget
If you're going to rev up to 8k a lot, an upgraded and reinforced valvetrain with a balanced crankshaft would be able to handle it, if not increase your red line. You can get your crankshaft balanced at quite a few machine shops, you just have to check locally.
The bigger turbo you get, the longer it's going to take to spool up. I think a T28 is fine and that's what I'm going to get. If you're going to keep the car up at high rpms and high boost, a bigger turbo will open up more power. It really depends what you want to use the car for.
If you get all of that stuff, and run a good amount of PSI, 350hp is definitely reachable. But really your HP/TQ depends on what PSI you run. With my setup, I want to set my wastegate at 7psi, and get a boost controller so I can 'trick' it up to 20 when I want to melt faces.
As for your manifold, each has its ups and downs. Log manifolds are good for lower end power, but since Civics don't have much to start with, I really don't see the point. To keep your AC/PS, it really depends on the individual manifold you get, as well as your downpipe's size/layout. I'm going to run a 2.5" exhaust and downpipe since I'm only shooting for aorund 300hp. A 3 inch exhaust is better for high HP applications, and you can get some that will bend to fit around your AC and stuff, but you have to watch out for kinks and other restrictions to the air flow.
Hope that helps!
you can thank my boring ass job for giving me so much reading/learning time.
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