No. I am more concerned with pistons. I have seen other motors built with CP pistons burn excessive oil to the point of driving the owners nuts. The alloys used for many aftermarket pistons is different than stock causing more expansion and contraction as a result of temperature. This will cause additional wear. Considering the number of high mileage stock motors out there speaks for the strength of the stock pistons. I just think their are many other things to update before pistons and liners should even be considered.

Ask the Audi B5 S4 guys with 3.0 liter builds how they feel about aftermarket pistons when jumping form 2.7l to 3.0. Many have reverted back to stock pistons because they work and are reliable with less oil consumption.

FWIW, I built a motor one time (not a Porsche, but I bet similar situations could happen)

I was dealing with a specific speed shop/tuner who had built several of these motors. I bought forged pistons through him, based on "our" goals with the motor. He ordered them at 3.500 in diameter. (That was "factory spec" meaning no boring.)

Well I get he pistons and head to the machine shop to have everything balanced...my machine shop (I trusted) came back to me and said look...the bore on these cylinders in 3.500, it is 3.504. In the end the tuner took the pistons back and I had my machine shop measure and ordered another set based on those measurements.

I'd be willing to bet that much difference would give a premature oil burn over stock.

Just food for thought. I really don't want to tear into my motor.

tim recommends using the stock pistons for what its worth. $5000 is a lot for the 3.6 to 3.8. if you have a ton of money, do it. not part of MY budget tho!

I am willing to bet Porsche puta ton more research into their piston on just the 996TT than CP did. And the mileage, power and durability speak for the product. Don't fix something that isn't broken.

I know and believe Mahle pistons are superior to most out there.
They make a lot of import OEM pistons besides aftermarket ones..
I have used many types of pistons in my life on my bike and muscle car builds and Mahle stands out.
Also since Porsche has there own sort of Nikasil coating on sleeves , you would have to get the after market liners coated to keep the same durabilty.. I sent my cylinders and liners, bike, out to Langcourt..

first start:):

Thanks bro..

That didn't take long. Impressive. She sounds great.

She is alivessss!!

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I am doing a rebuild with 102mm CP piston and 102 mm darton ductile sleeve