X4 and I'm sure there will be more
But if you want to learn about spark plug gap requirements and have the time, try opening up the gap while driving around and keeping boost and fuel pressures the same, you will "teach" your self the effects of what happens when the ignition system weakens, start with .032 and work your way up, these coils are desiged to work with very large gaps when normally aspirated, better now than guessing later.
You also might want to check intercooler/plumbing the same way by loosening hose clamps at the turbo to IC, Learning cause and effect will pay many dividends when you actually do encounter problems and need to get to root of the cause. Good luck.
i bought a set of NGK ur5 and set gap at .032
car starts a little rough but idles good...
and it smells a lot like fuel....
should i gap them differently or could there be another problem...
(already looked for gas leaks couldn't find one)