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So I have a 2004 5.7 Hemi and have decided to get a new throttle body. I have BBK shorty headers, megnaflow catback exhaust, K&N CAI and once I get the TB I'm getting a tune from Hemifever tuning. This will probably be the last mod I do. So which TB would be better for me? The 85 or 87? Also I want to keep as much low end torque as possible.
 

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From my basic knowledge I believe you will want to get the 87mm once you start moving away from simple bolt-on mod.

Need a confirmation on this though.
 

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keep the stock..the only thing a tb is going to do for you is throttle response...once you start going into internal mods such as heads and cam then stepping up to a 85mm can be done only if it is a true 85mm bore with a 85mm throttle blade unless its still flowing the same...
 
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