Originally posted by Purple94Z28
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You don't need a 58mm for a N/A.
There is a point of restriction but also a point where restriction is good to create velocity.
A 383 at 100% VE and 8000rpm consumes 886cfm.
http://gmtuners.com/flow/
As you can see a stock LT1 TB is calculated at 783cfm.
A Twin 52mm would be perfect.
It will flow enough air but also create velocity which will help the engine consume.
Having heads that are so open they flow 400cfm doesn't mean crap if there isn't velocity in them.
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For the restocking fee, this is where research comes in before buying parts. Sorry had to be said, not trying to be a dick.
Just pop in for a question and you'll get your answer.
Remember 3 opinions are better than one.



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