Quote Originally Posted by UselessPickles View Post
Depends on your definition of "need".

I don't think any of the kits *need* a catch. The kits come tuned to account for the effective reduction in octane of the fuel due to oil vapors from the PCV system. Using catch cans removes oil from the air, which can allow for more aggressive tuning.

This is not unique to the Pentastar. All engines with PCV systems (essentially all modern engines) suck oil vapors from the crankcase into the intake. It's normal.
X2 Pickles. Catch can is step one in dialing in the motor. I got an AME Failsafe A/F gauge and wideband O2 sensor. Installing in a couple of weeks. Then on the dyno for a couple of days to tune the motor. Not for aggressiveness. Tuning to smooth it out and put the power where I want it.