My Q4 doesn't pull cleanly in the top range. It lacks obviously some power and the boost gauge says it only has 0,5bar of of boost. It ticks over nicely and pulls good under 4000rpm, but full throttle acceleration is disappointing.
The car runs on a temporary exhaust at the moment and it is quite restricting. I have also checked the vacuum and inlet pipes for cracks and leaks. It has new plugs and an air filter.
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