ok i know this topic has been covered alot i did a search and read the stuff there. but how lean can you go if you run open downpipe? my a/f is 12.1 in boost on full exhuast. can i run opendown pipe without leaning out?

 

someone please help

 

help please

 

hmm....i'd like to know the answer to this too
bump

 

It's been debated on here. The concensus....you'll lean out. How much??? sometimes a lot and sometimes a little.

I run open downpipe with the hack. Except i set my VAFC a little richer to be safe.

 

Depends on how much boost, and how much fuel you don't add.