do all 3 ports on each side need to be cleared?
since the airflow from all 3 ports meet up before the o2 sensors for the test maybe just having 2 ports on each bank cleared will allow enough airflow to meet the test.
if rerouting the plumbing directly to the cats pre sensor works it might be that just having 1 port on each bank clear allows enough air to meet the test as long as the check valve is in working order.

Don't know if anyone has done an experiment on this, but "while you're in there", you might as well do 'em all.

I ended up able to clear 2 ports on one side and only one on the other. So far (knock on wood) I've put on about 8K miles and no CEL. I tried every kind of wire, cable and even my hammer drill, but could not get all three ports. I'm also on Larry's 2nd list for the magic box as I WILL NOT under any circumstances attempt that under the car on a creeper ream job again. So to answer K722070's question, apparently you do NOT need all 6, at least I didn't.

Dennis, how much oil are you burning?

Apx 1qt per 2,500 miles. A tad more when we go to the track. :burnout: Nothing but Brad Penn 20w50 for 3 years now.

It is official - given up...
 

After having tried everything I could try (all sorts of cables, sheaths, solvents, pushing air, casting spells, cursing (a lot)), I tossed in the towel. One of the SAIs was just plugged solid, and I spent most of the time on it.

On the bright side, now I have 8 new gaskets and a new air check valve in my cab. And, I can now drop and put up heat exchangers in a reasonable time. Same with the airbox.

And, at least, I can say that I have tried.

I cannot believe how tight the access is to some spots - I think Porsche did it deliberately to discourage DIYers.

Now I am left with some one-off tools - filed-off crow-foot wrench, quick-disconnect welded to the bottom of the old check valve, six cans of carb cleaner, a gallon of paint thinner, pipe-bomb-looking contraption that I fashioned to see if I could push a larger slug of solvent down the line (couldn't), and some other miscellanea.

Kudos to those who traveled down this path before me (I used a number of write ups here and elsewhere). And thanks for everyone who encouraged me.

Next thing - the "electronic route". Ultimately, cheaper and less frustrating. Either that, or a piece of electric tape over the CEL.:roflmao:

Sorry to hear M. I would think that with 5 of 6 ports clear that the SAI check engine light would not light. Just speculation on my part though. Good luck with it though.