I have a gm crate ls3 we twin turbo’d on E85

when we got it tuned, we had the corrugated hose that goes from the valley cover to the intake manifold hooked up. No other pcv hoses ran. Just the small vents on the valve covers ran to a small catch can.

but now I removed all of that and capped both the valley and intake, and now have both valve covers vented with -10 bungs and lines to catch cans.

two questions-

1.) will this change affect my tune? Not having the valley running into the manifold behind the throttle body?

2.)was the hose running from the intake to the valley a boost leak pushing air into the crank case under WOT? Cause now that they are both capped the car feels like it has slight more power.




removed this hose and capped fittings-