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The twin turbo conversion shouldnt have any pulse problem, since the turbos are connected in series (one after the other).The only drawback is the complex tubing required and the control valve.
A bi-turbo conversion, would require major tubing fabrication and very careful planning on extractor length, shape (ie routing). Best guess could be to "copy" the 993 bi-turbo setup and make one for a 4 cyl engine...
Another aspect on this kinds of setups that require very good design are the intake manifold (single manifold for both turbos or two for criss-cross and even loads?)
Chris
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Aircooled 4ever
1973 1303 going towards GL
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