Wats up everyone. I'm wondering if I should wait to tune or just tune now. I have fujita intake, 5/16 md spacer, 3 in single apexi exhaust with megan y pipe. My question is should I get hfc before I tune or will it not matter. I have 04 at and I'm gettin an osiris tune

 

I'd say get the hfc first

 

get the hfc they free up ~10 hp.

 

Wait until you have all of your breather mods installed then tune it.