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i have a gt40 intake. do I have to do anything for upgrading to a 70mm throttle body???
 

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You might need to do some minor porting of the inlet. You put your gasket on there, scribe around it with a punch and then use a grinding stone like a Dremel and enlarge the port. If not, you could have a partition there after the throttle body and this will disrupt the airflow and that could cause a hesitation and stumble. You take this small amount down so it has a smooth transition, and you won't have that problem.
 

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it should be a straight bolt on, but make sure you get the spacer..
 
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