For those running a roots type blower, aftermarket or factory, you may find this interesting. I cannot speak from experience on my own car yet, but it has been dyno proven to add 20-30 rwhp on the 2v Lightnings and about 25 peak rwhp on the 4v Cobras and i'm sure it has the same potential for all roots blowers. These are some pictures of a ported roots type blower off of my friend's Lightning:

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Ported

Unported

Nick