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GTS300s are great scooters, but, he has this one priced about $1,000 too high.I don't have an aftermarket exhaust on mine, but have several friends that do. All newer Vespas have CVT so the engine revs to optimum torque and drones away - not something I personally enjoy listening to.
If you're not excited about owning an older Vespa, you might be after reading this! https://santafe.craigslist.org/mcd/d/vespa-gts-300-super-maxi/6668253924.html
I purchased my '13 GTS, a stock fully loaded touring model with 3700 miles, for $3200 and couldn't be happier.
I paid too much for ours, $3,700 for a 2007 GTS250 with 3,300 miles in 2012.
You only paid 'too much' if it didn't live up to your expectations or keep your interest. I purchased Gigi this last March and she is worth every penny.