Diffrence In Rjc & Accufab/kenny Bell

What is the difference between these three plenums also is it worth changing to a 70mm TB from a 65mm TB just trying to get some opinions.
 
What is the difference between these three plenums also is it worth changing to a 70mm TB from a 65mm TB just trying to get some opinions.

To add onto that....

The 75mm plenum... who makes those? Are they champion units? Is there a power plate for them?

Didn't mean to thread jack just hoping ppl could answer this while on topic...
 
will i also notice a different plenum that g body parts sales with a buick symbol on it looks bigger then the ones i mention above.
 
Is this for your modded GN? Size is determined by HP of engine combo. The PP does make a difference in flow distribution so using it would also enter in to which one. Don't know the difference if any on those models listed? Check with a builder/tuner for their expertise. MHO Gene
 
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