Exhaust size
 

I'm currently running RA manifolds with 2.25" outlets, with a full 2.25 exhaust with crossover and the head pipes are 2.25" 90° mandrel bent.

Would there be any point/benefit to stepping up to a 2.5" exhaust like pypes kit for instance even though the manifold outlet is only 2.25"?

Never mind I just read that sticky exhaust article. Very informative.