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actually, i have to "beg to differ".
We just finished assembly of a 13b with S4 9.4:1 rotors and S4 turbo irons. Running on an Megasquirt unit and a distributor.
The thing is, the 6pi end plates can not make the power a 4 port ones can. Porting everything to flow well and maintain a desirable velocity and have your choice of port timing is easily done on the 4 port. But the 6 ports are basically the opposite of this.
I say go for it! I'm starting to stray away from turbochargers when i can. Its a huge step up in complexity and money with the benefits of a shorter life span.
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