I have had storage heaters removed and replaced by central heating. Now the copper pipes look awful as I have been unable to run them through any floorboards as I have concrete floors.
Any primer and paint that are formulated for metal. Rustoleum is one brand
Like the one the car comes with or some other over priced pretty thing?
Cold air is more dense than warm air. Therefore, you'll get more power (and slightly less gas mileage). When I went to CO last year, my MPG was better at higher altitudes because less gas was needed in thinner air. But at a cost of power to climb up the CO mountains.
Those things are a waste of money unless you are racing. Keep your car stock as much as possible. Your car's computer will love it.
Copper pipe was originally used and for ducting steam in power stations, and is designed to withstand 2000 pounds a square inch pressure, old water pipe if you recall was made of lead, so unless they have changed the spec of copper pipe dramatically it should be more than adequate to contain 150 psi Air Line Pressure, I've used in the past with compression fittings and had no problem, even plastic water pipe can be used for this purpose, so long as the joints are allowed to dry for 24 hours or only half pressure is used after 12 hours, some repair shops use galvanised conduit for this purpose.
