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Any "thoughts" on how restrictive 3 in piping for cold air used on for a turbo with a 4in inlet.

Basicly I have a T66 bb turbo...but dont have room to run a 4in inlet CAI I do have room to make a 3in CAI. Currently Im running the turbo as is...no cold air source.
 

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what car is this on? I just had the same problem when we upgraded from a 58 to a 76 but just made an intake for myself.
 

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I think you will be fine with a silicone 4" to 3" adapter. I could be wrong and Im sure ill be corrected if I am, but it will probably effect your spoolup time more than anything. The compressor inducer after all isnt 4" wide.
 

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cwtt - who's car is that?
 
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