I''m changing the engine in my Amazon and the new bigger engine comes with a different carb set up. The motor is complete as we took it out and staying as it is as it runs great. I have the front part of the exhaust off the new motor and want to join it up to the original exhaust. The new exhaust is 50mm and the old is 45mm. Is there an easy way of doing this, maybe a sleeve i could buy to do the job? Possibly even something flexible should it not meet dead straight on, though i think it will. Need asap as the car has to be ready for the Hayride.