The aftermarket tubes make no real difference to the speed of 4 stroke scooters but they do not rust as fast as standard ones and they are ligher and sound prettier. Her for sale is my step sons Gilera DNA 50cc it had many new parts and money spent on it in the last few months but now he no longer wants it as he has a car. You can view and print the entire repair procedures with this service workshop manual download you dont have to be proficient with a computer. Ive never really had any problems with me when it was but having said that my water pump went the other day but its the first real problem Ive had since I got it. This highly detailed service workshop manual download includes everything you need to repair maintain rebuild renovate or restore your vehicle this guide is provided in easy to use PDF format.Aftermarket pipes make no real difference to speed on the 4 stroke scooters howver they dont rust as quick as the standard ones and they are ligher and sound nicer.Her for sale is my step sons Gilera DNA 50cc its had loads of new parts and money spent on it over the last few months but now he no longer wants it as he has a car.You can view and print out the complete repair procedures with this Service Repair Workshop Manual Download - you do not need to be skilled with a computer.I have never really had any problems with mine when it though having said that my water pump went the other day though thats the first real problem I have had since I got it.This Highly Detailed Service Repair Workshop Manual Download Contains Everything You Will Ever Need To Repair Maintain Rebuild Refurbish or Restore Your Vehicle This Manual Is Supplied In Easy To use PDF Format.