Hey I have a quick question... I have an SAFC2 tuned with
HKS SSQV BOV
APS 3" Turboback(nocat)
MBC set to 21.5
Open air filter
Walbro 255 Fuel Pump

and If I wanted to change the HKS BOV to an MR DV do I need to retune it?

 

Unlikely, but if you had some type of leak with your old BOV and now you don't...you'll need to make some minor changes.

 

you should not need a retune for changing your bov

 

okay because I thought the the hks ssqv would make me run rich, then putting the diverter valve it would alter the air amounts.

 

Well, an S-AFC is meant for tuning yourself, so after changing BOVs, go out and tune it to make sure...