Can't give you exact spec's on the K27 as the tag is missing. P.O fitted it.
RWHP before B.L WUR,Fabspeed headers and Zork was 287RWHP. We only did one pull as we could see that the AFR’s going way too lean for comfort.
Post B.L WUR and headers the car is puling like a champ. I’ve got the RPM CSV set at 4,200RPM so it’s sitting on ~mid 12 AFR then leans off again once past 5,500. Once we saw it hit 14.2@6000rpm we called it a day.
There was no 02 sensors in the stock headers when I got the car so I’m going to say no lambda.