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Discussion Starter #1
~800rwhp now ~1200 later

My turbo has a 3.5" outlet and my throttle body is 4"


I have a bunch of 3" or 3.5 or 4?
 

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~800rwhp now ~1200 later

My turbo has a 3.5" outlet and my throttle body is 4"


I have a bunch of 3" or 3.5 or 4?
With those power goals i would go with the 3"
 

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I wouldnt neck down the turbo outlet.

Do you have an intercooler?

What intake TB setup?
 

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Anything that would hurt me by necking down the turbo?
No because chances are that you may have a 3.5" outlet flange put if you measure the actual hole its probably smaller then 3"
 

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Discussion Starter #8
Turbo is a gt5518 and the intake is stock lq4 truck I take

No intercooler running straight into intake and running e98
 

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Run it in 4 and be done.
 

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I did a 3.5" on my 6.0/S480 setup, for the simple reason that my turbo outlet is 3.5", and my carb hat inlet is 3.5". It makes ZERO sense to me to neck it down.
 
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