I must say I'm not a professional and never took my car to a dyno, just talking about feelings and ALSO my engine changed from stock 400 to a 451 stroker just right before the FBO ( can't recall if also with the 400 ) . Most of the time I used the Chromed on the stock 400. Can't recall if the Chromed was tested on the 451. Used the orange after the FBO fail while the High Rev arrived.
the Last Chromed just last long 2 weeks. Maybe right after the FBO ? can't recall really.
and also being not a pro, my experience on tunning the engine is poor, and I have being changing timming, mixture etc.. constantly.
Lats time I drove my Charger was 4 years ago and was with the Re-N-Nator, and will leave the bodyshop with it too. Don't think will look back to other one. High Rev will be my spare on trunk