> 17 cars and a seriously cool... Magnum Automotive are on the move! As of the 30th June 2017 We plan to re-open on 10 July. You will be able to find us at: 741A Te Atatu Road Te Atatu Peninsula (Customer access at Gate 1 on Wharf Road) Postal Address remains the same: PO Box 84096 Westgate... Marinised 350 Chevrolet for pleasure boat duties. Grazza made a cool 6″ tube muffler for this set up. Will have a single 4″ exhaust outlet.