We have designed a lightweight pulley that replaces the factory crankshaft pulley and shaves off 2.8 lbs off of the rotating mass of your crankshaft assembly! This might not sound like much, but nearly 3 lbs off of the spinning mass of your crankshaft makes a considerable difference, and improves your cars throttle response dramatically. Your Caliber SRT4 will be much more peppy and responsive in ALL GEARS !

This pulley has the exact same diameter as the factory pulley so you can use the factory belt! After installing this pulley you there will be no drop in performance from your power steering, air conditioning or the alternator!

Because there is only one bolt holding the pulley to the crankshaft, it slides on and off easily, and because you reuse the factory belt installation is a BREEZE ! Our mechanics installed this pulley in less than 20 minutes on our project Caliber SRT4!

Now, onto the weights of the pulleys. On the left you'll see the MPx pulley, on the right you see the factory pulley. By installing the MPx pulley you will shave 2.8 lbs off of the rotating mass on your crankshaft which is substantial !

For those of you who are curious where the crankshaft pulley is located - its on the passenger side of the car and is easily reached after removing a plastic splash shield behind the passenger wheel.

FAQ (Frequently asked questions)