I'm new to Vespa tuning but have owned a Vespa Douglas 150 Sportique, and an ET4 in the past.
I'm very close to purchasing an as-new 2016 PX 150 euro3 with catalyst.
I would like to have a little more performance than standard, but want to retain the catalyst, which I know is very restrictive.
Has anybody an experience of dong this, and can offer me any advice?
I have found lots of information online, but everyone starts with 'change the standard exhaust'.
Would adding a larger cylinder kit and less restrictive ignition but retaining the standard exhaust offer any benefit?
Has anybody tried adding a standard or performance catalyst into a performance box exhaust, or does it just remove any benefit of the performance box?