Sito Plus Exhaust for Vespa LX150, ET4 COMPATIBILITY: Vespa LX 150 (2006-2009) – Leader Motor (2-Valve) Vespa LXV (2007-2009) – Leader Motor (2-Valve) Vespa S 150 (2008-2009) – Leader Motor (2-Valve) Vespa ET4 150 (2001-2005) – Leader Motor The Sito Plus is hands down the most popular upgrade exhaust for the Vespa ET4. Similar in looks to a stock pipe, and just a tad louder, it gives a boost in performance by allowing air to flow through more freely. Don’t forget you’ll need to rejet your carb! This product is intended for off-road use only. **