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My experience has proven that a PCV will make a Guzzi, and any other I reckon, perform better, if it's the only viable option. I put one on my 99 Bassa and had it tuned on a dyno for improved drivability. It did improve drive-ability and my enjoyment of ridding it was certainly greater.Couple years later, I took it to Jim Barron who at the time was in Woodstock IL operating a Guzzi dealer, and asked him to give it the works over since it hadn't been given a "tune up" since it's 600 mile service years back. Jim is one of the best techs in the nation. When I went to pick it up, he handed me the PCV and told me I wouldn't need that any more. I was a bit dubious, as I had spent hundreds getting the PCV dialed in, but I was wrong. Without added, non OEM fuel devices he was able to tune the bike to run far better than it had ever run, period.My point is, if you can find somebody that really knows their shit around FI Guzzi, and has the right tools, they can get them to run the way they should, and it's great! But getting access to someone of that ability is not always practical. I believe Jim is still operating as an independent in Ringwood, Northern IL.