No structural modifications to the motorcycle are required for installation in order to use the product in an approved version. It is recommended to read the instructions in the package or tutorials visible on www.gpr.it and on youtube. For online purchases, it is necessary to activate the guarantee by sending the appropriate coupon stamped by the installation workshop by email to certificato@gpr.it, for purchases in physical stores, the store stamp is sufficient. The exhaust has a removable dbkiller (noise limiter) for racing use, removing the dbkiller is not ONLY illegal, but the customer assumes responsibility to use the motorcycle as on the track only, without saddlebag, flashlight and license plate holder or other parts that would conflict with the different angle of the gas as a result of transformation into a racing version. Abuse of this situation on the road will result in the loss of the product **and any refund request will be rejected. The **is two years from the purchase, with right of repair with devolution to the GPR factory or the nearest official distributor at the expense of the customer. GPR cannot supply a new muffler instead of the one to be repaired, the customer must agree to reassemble the original exhaust or wait for the standard time for repair.