for Vespa GTS i.e. 250ccm Euro3 stainless steel color silencer: aluminium form silencer: oval with catalyzer with ABE TUNING ROAD – for everyday use Product description CAUTION : Due to the very soft suspension on standard scooters, race exhaust systems can quickly come into contact with the scooters frame when fully compressed. The rear shock absorber should always have its spring pre-load adjusted to maximum compression. To be completely on the safe side, a stiffer after-market race shock absorber system should be included in the set-up of your tuned scooters suspension.