Ah I getcha, the number is the wheelbase in inches! Cool...

Thanks for these thoughts! So, big question (does this cause debates?) - which is better for offroading - SWB 90 or LWB 110? (Oh, and what's the difference between a 110 and a 130?)

Ah, air intake rather than exhaust makes sense. What happens if you stall in water though? I guess the water gets pushed out of the exhaust when you turn the engine over? And I also guess that the snorkel is only necessary if you're planning to drive through water that would come up to the top...

I'm looking to buy a second hand Defender to do some offroading and to use as a utility vehicle hard top, plenty of seats etc), and would be grateful for any advice - particularly on these points: - I've seen on some that they seem to have an exhaust that goes up to roof level. I'm guessing...