As the saying goes you get what you pay for... but I've clean snapped the pinion shaft of an aqua torque starter in half (9 tooth) and I've heard/seen slot of others online saying the same about SBT advice from the gurus is if you can, buy and rebuild an OEM denso starter I couldn't find one and I'm in the uk so new OEM would cost me £250/300 or $375/450 so I went with an aftermarket one from psykho sports, I'd not heard of them but if aqua torque and SBT snap it was worth a try n so far seems good and that cost me £100/$150
So in summary, if you can buy/rebuild OEM, if that's not an option get an aftermarket one but don't skimp too much on the price, as I first mentioned you get what you pay for
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