Re: WQ Fiesta XR4/ST150 with Mazda SP25 engine
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It's definitely a good idea to upgrade to a 6 speed manual gearbox/LSD as the standard ib5+ gearbox is a light duty unit,and won't last long once you up the power and torque.I owned an XR4 from new,and although the gearbox never blew up on mine,I saw many of these gearboxes blow up behind the standard 2 litre Duratec HE.
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