1.) Yep, a header is an exhaust manifold.
2.) Personally I´ve done the same. I´ve bought a K&N replacement filter for my Lude. You won´t get a big gain if you see one at all but it also doesn´t hurt the performance. But a CAI would be a better choice if you´re looking in high-end power and unless you´re not driving through very deep puddles you shouldn´t get a problem with hydrolock. Predator and TheMasterG use them and they never had a problem yet. But like I´ve already said before your low-end would suffer a bit with a CAI.
3.) VERY RIGHT!!!
And by the way, when I´m remembering right nobody in the europe forum has done internal engine work. I think TheMasterG might become the only one after having his new engine swapped in.
4.) Agreed!
5. & 6.) Not sure about that! Most people in here would say it doesn´t do anything if you don´t have got some mods done to your car. Personally I wouldn´t buy it because you´ll just need more gas for a minor gain and because it also has to be dyno tuned otherwise it´s possible that you´ll run too rich.
I also know this phenomenon with the full tank. :silly2: But I really don´t have got any idea why!!
Hope it helped a bit!