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Discussion Starter · #3 ·
I read that you can drill the housing so it vents both sides instead of just one. it currently only vents 3 cylinders when it opens, and can cause boost creep.
Dual k20's has posted to drill it out several times.
after looking at one, I guess you need to take to back housing off, open the wastegate and drill thru the wastegate hole into the center divider.
 

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I think there might be a writeup over on DTR that I read once, but I'm not a member there so I can't search.

If I remember right someone once told me it only needs to be 9/16 hole?!?

Another option is to grind out the divider like this
 

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It might affect the spool marginally. But I've got a 16cm housing and I can barely tell the difference from stock 12
 
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