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What if any effect would increasing throttle body size (68 or 70) have on my car which has K&N's, headers, high flow cats and Borla exhaust? Is increasing throttle body size only useful if you have a blower or ported heads, etc. or can you also increase flow with otherwise stock setup (given the need for A/F remapping)?
Ray
 

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i lost 25 pds of torque on a simple bolt on motor with 70 mm throttle bodies. not worth the money until you do more mods.
 

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^^^What they said - there's no gain and potential for loss with bigger TB's on a non-stroker, reletively stock motor.
 
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