whats the standard ampage rating of these and are there any cheap higher ampage rated versions as thebattery tray is pretty big?
It should be 55Ah on a Turbo. Strangley tho the 2.2 has a 66Ah one as standard
72 amp hour "Go" battery.
Tell me what you've done, not what you're going to!
I dropped a 66Ah Go battery in the turbo last weekend and it was somewhere in the 30-40 notes bracket (can't remember exactly) from the local dealer here...
GM72H3 Go battery from Vauxhall fits Astras, Cavaliers etc. you may find a bigger one to fit a G, but the next size up increases in height.
Cheap from vauxhall trade club.