Yes, I got hold of a used Expansion Pak for my Nintendo 64. It was really worth buying it (paid 13 euros for it), most of the games I've tested so far run in hi-res after the memory upgrade.

Wipeout 64 looks totally sweet now, among other things the engine exhausts are even better looking than in 2097/PS. Hmm, hope the increased graphic quality will inspire me to work harder on my times.

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edit: seems I got too carried away, 'cause the pak didn't actually make any change... except in my mind. Placebo effect?