Martelius exhausts for sale

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gt99 Wrote:I think You misunderstood me. I am talking about manifold bolt holes. 16v and 20v manifolds have different positions for manifold bolt holes at both sides (all three center holes are the same).

For example here is Silkroad manifold for 16v AND 20v engines. As You see there are 2 holes for bolts at this side (and oval hole for diferent bolt position at other).

I am thinking about buying R1 manifold this winter for ae86 with blacktop, but I really would not like to modify the manifold flange.

edit/ answer: Martelius have chosen the same solution. 2 bolt holes next to each other.
This way you can use the manifold on both cylinder heads.