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Today on our 2015 Jeep Wrangler Unlimited we're going to be taking a look at and installing the SMI Stay and Play Duo supplemental braking system, part number SM99251. Here's what it looks like once it's installed. It's going to be a proportional braking system. It's got an inertia switch that's going to help it activate. The proportional part is going to be as you step on the brakes in your… see more >
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