What's the differenc between the pzev and fed engines? And what can I do to make it into a fed spec? my original engine was a fed but my new one is a pzev and I don't wanna lose the hp so I wanna know what I need to do to fix this.

Thanks

 

The PZEV's have an extra cat and other minor changes.

This was covered before:
https://www.evolutionm.net/forums/la...-pzev-fed.html