boost controller single solenoid

G

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Hi Guys just revisiting the question as I didnt get a accurate answer.
Can anyone tell me if there is any difference between a single solenoid eg the blitz controller as the have a spec r and spec s.
One is single and the other double solenoid.
Whats the difference and is one better for a twin turbo or is there really not much difference at all.
Cheers
 
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