Thread: Free HP
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Old Oct 26, 2011 | 09:36 AM
  #29 (permalink)  
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onehundred80
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From: Ontario
Default Re: Free HP
Originally Posted by sive81364
yes the 74mm Tb
My understanding is that the NA intake diameter is already 74mm and opening up a 74mm TB to a larger size would make the bore larger than the intake hole. This would hinder the smooth flow of air.

The TB's that are opened up on the NA are the 68mm bores and these are opened up to 74mm.

If you have a 74mm TB it fits fine the way it is. The larger bore sizes you see mentioned are on the SRT6.
 
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