Even with the 911s, I don't think Porsche ever makes it "easy" to mod their engines. I think that the 911 crowd has more dough and has been at it for many years (modding that is) so there are more parts for sure.
I also think the Box has been thought of as a "economy" Porsche by the aftermarket to some degree, thereby limiting how many vendors will invest in the go fast parts market.
Just a hunch!
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