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I did reinstall the factory bolt though. I believe the bolt can be used twice so you will be fine. Just follow Steedas instructions you wont have a problem. Just make sure you get the Chrysler Harmonic Balancer Puller for removal of the factory pully.
Yeah I noticed some high end power increase, but it hurts the low end torque a bit. Gears should help fix the low end torque loss.
Install is easy as well.
Sounds like you need to get a tune from Justin at VMP Tuning. I had him dyno tune my car after doing the CMCVs and I didn't lose ANY power ANY where. I did gain more power mid-top. But it was a gain all across the power curve. I didn't lose any gas mileage either. Actually gained .5 mpg. I gained 12 rwhp from both the UDPs and CMCVs.