would be a REAL bitch to get rid of the flapper altogether. But would be to your advantage cause you could reall port the hell out the opening.
You could just pull off the actuator arm and tack weld the flapper open.
edit: you "may" be able to take the o2 housing off with the turbo attached. That would make it easier since you'd only have the dp left to unbolt. The reason I said "may" is because if those o2 housing bolts were toqued real tight, you may not have enough room to get at the back one. I know it's real tight on mine and have to use a wrench rather that impact gun or socket/ratchet because of the tubing is right over the bolt.

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-Tony <--- NOT asian.
'06 Wicked White EVO IX