1) Throttle bottle comes after the intake pipe (where it is attached to the engine) and before the intake manifold...(back of your engine) its where the air is let into the manifold depending on how much throttle you give the car...

2) A BOV (Bloow-off vavle) does what it says...it's a valve that 'blow's off ' any excess pressure in a turbo reducing back pressure and giving u more air flow/power...it adds a nice pssshhh sound as well....

3) Uhhh....I dont think so...i could be wrong....

4) Christ that's a lot of miles. Look at getting you're compression tested, and your valve timing corrected...that many miles can cause problems in that area...

5) VTEC doesn't kick in at one standard point, there are many variables that can affect it's 'kick in' point...but it basically kicks in AROUND 5,000 i think...i duno I don't have it....

6) An SOHC has less performance than a DOHC does because...well....one has 2 cams....lol...sry.....for #5, this question, #7, and #8.... goto www.howstuffworks.com it has articles on how an engine works, both SOHC and DOHC, also how VTEC works, and even how a Turbocharger/Supercharger works....You can learn a lot, but there's nothing like experience...

Hope this helps, sry if I'm wrong about some stuff....