I can see a few advantages of these. One they won't get rusty. Two they have a longer ramp and less of an angle so low cars can get up. The foam is one peice so no weak points or welds to fail. Plus they look pretty good
I doubt it would be the headgasket but it could be. I've not seen many N/A head gaskets fail. The gaskets I was on about are the rocker covers ones (I think) they can let oil into the spark plugs but at the top side. http://my350z.com/forum/maintenance-and-repair/518576-oil-in-my-spark-plug-well.html
If its oil on the top of the spark plugs then Its something to do with the gaskets Im sure. If its oil on the electrode side plus you have high oil usage that could be a problem.
What grade of oil are you using?
If you are facing the car its on the bottom left hand side. White plugs. There is another but I thinks its near the middle and its one fan to the other but I cant remember.
I was looking at these ones from the US but this might do the job nicely. I have a low entry one but my car is lowered so its a pain to jack the car up.
You could. Im sure it would be like wiring up any aftermarket fit unless the wires are already there for the bose.
You most expensive part might be the headunit as it needs to be married and divorced to the car Im sure.
Why not go for a becker head unit. They are the most OEM looking things in the world.
Ive got some speedcats or futurecats. Im not sure they look the same. I want the red ferrari ones.
The puma shoes I have are very thin soled and are great for driving but my feet get a little hot in them.