It will only affect the oil pressure if it was missing that race that goes in the block.

My turbo engine has the elimination kit in it, and it does give out some more vibration around mid-rpms, but not all that bad, I just remember that it's a utility vehicle and don't expect it to ride as nice as my Honda.

1999 Mitsu Montero - Crappy Weather
1992 Isuzu Pickup - Zombie Apocalypse
2008 Saturn Sky Redline - Nice Weather