What do you guys think is better a new plenum all together or is a spacer good enough?

 

Nooooooooooooooooooooo!!!!!!!!!!

 

"What do you guys think is better a new plenum all together or is a spacer good enough?"

its up to you dude.... and what application you are... IMO the motordyne spacers are an excellent option.
check intensepower.com group buy on them

 

NA- spacer I would get motordyne 5/16 (showed best gains on plenum shootout and get to keep stock strut).
FI- Full plenum (less chance of leak from what I hear)

Do a search, there is dyno numbers comparing all brands and designs.

 

Do some searching man. This topic has been discussed tooo many times.

 

Check the Sport Z Magazine Plenum vs Plenum Shoot Out. The choice is pretty clear.