Before you order a Monza, check for a Bosal. I've installed a Bosal 15 years ago on my '75 MGB and it's like AS I'VE DOE IT LAST MONTH. Bosals are guaranteed as long as it is installed on the car and the sound is genuine MGB. However I strongly recommend, whichever brand you select that you have a flexible insert installed between the manifold and the catalytic converter. This will prenent excessive and frequent loosening of the exhaust to manifold conection and visits to the muffler shop , tickets for «driving straight pipe» and exhaust infiltration inside the cockpit.