Which rpms does the engine limiter stops the acceleration at?
It seems the limiter avoids the engine to take more than 6800/6850 rpms. Sometimes I got more rpms, almost 7200 rpms, which is a bit optimistic. It doesn’t look the case to wait for the action of the limiter: better change the gear at 6500/6600, so that you don’t encounter that noisy vibrations ! Rear door spoiler Stelios has detailed instructions about that installation and some nice pictures too. He called it the Abarth spoiler, but there are also other spoilers with central stop lights.