If anyone is still interested in this mod, I have done it and run it successfully on my 2003 986S without any problems for over 2 years.
I used the stock MAF holder and coupled it with larger diameter tube on either side, so there is an unavoidable loss through the MAF if you want it to run properly. I still feel that the flattening of the torque curve and power increase is more than worth it.
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Current: 2003 Boxster S. Guards Red/Metropol Blue. LN IMS, Numeric, PSE, Koni Shocks, Eibach Springs, and a few other things...
Former: 2005 Mercedes C230K 6MT.
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