I installed the BimmerFix stent in my 2008 4.8l as a PM item when my water pump bearings went at about 72k miles. I had the water pump out and decided I might as well go for the stent as a PM item.

The only tricky part was a bit of sanding and getting the grit from the sand paper and the aluminum dust/particles out of the coolant pipe, not hard, just wanted to be very thorough.

Found it a bit tricky to get the last inch or so of the stent to slide into the coolant pipe. Luckily I had located a 1/2" drive socket that was just the O.D. of the pipe and exactly the depth needed, so I just used the socket to set the final depth of the pipe in the coolant pipe.

The foam brushes cleaned up any silicon that was inside the pipe I.D. without any problems.

I have a Hamburg Tech 90C thermostat in the engine and I had been watching the temps closely with a UltraGauge before the pump was replaced and the stent was installed. If the stent impacted the coolant temp any at all, it was likely only 1-2F at best if there was a change at all.

In hindsight if you replace your water pump, which I would recommend as a PM by 70k miles if you have not already exceeded this, I would plan on installing a BimmerFix pipe.

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2008 4.8i Black with Tabacco. Black Y-spoke wheels and shadowline trim.