Straight cuts = noise.
6 speed = stock quiet.

Both will handle good power.

Unless you have a specific need for a 5 speed box, get a 6 speed with a good clutch.

Also, having the 'unbreakable' gearbox will not stop you breaking it if you cant drive (tm).

Once these parts are upgraded, expect the next weakest link to break though.

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[COLOR="Gray"]550Nm off a 2L... Just wish it was in the dak dak...[/COLOR]