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996 to 986 motor swap

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Down to final steps of a 3.4 swap into my 1998 Boxster ( including a 6 speed trans).  I have a number of questions I hope someone can help me with or answer for me.


1.  I have enclosed a picture of my exhaust headers.  Note the inside diameter of  58 mm.   Also note my fabricated intake manifold (Blue silicone piping)  3 in. ID.

     My question is how far away from the throttle body should my MAF be placed??   I am using a BMW MAF holder (black tub)with a Porsche MAF.  Should this BMW tub be as close to the throttle body as I can get it or much further away as it is in the stock Boxster close to the air box??


2. I would like to fabricate a pipe to eliminate my CAT.  If I do this can I eliminate my post CAT sensors??


3. The stock DME is Motronic 5.2.2 and is the same DME model that was in the 996 the motor came from.  Will I still have to flash the DME before the car

    will run??   I know if I drop the post CAT it will need a special chip what if I do not drop the post CAT ??


4. I would like to post a mistake list detailing some of the mistakes I had made on this journey if there is any interest out there...is there??







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  • 1 year later...

Definite interest in mistakes. More and more dais going to occur over time so any and all info very useful. I'm in process of a 03 3.6 into 03 986S swap and while there are bits and pieces, I've yet to find anything comprehensive beyond what Wayne at pelican did for the early 986 cars. I'm going to document my journey as well.

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  • 4 weeks later...

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