OK, I got the RBC as you know. I have now fixed/ tighted my header. That helped.

AND

I have replaced my flexpipe with a double braided on on the topspeed SS header. It was cracked.

Its a LOT quieter and it seems to have more torque and smoother power delivery. Its noticeable.

On thing I do notice now its all fixed is that its doesnt seem to be reving as hard at 6000rpm +. Then again that could be pyschological as its quieter.

Is it possible that with my mods the stock exhaust is now restricting my top end? I didnt notice it with the flex pipe as it was cracked an releasing pressure no doubt...

I have:

Jtune Mild
Comptech Icebox with KN mod
Topspeed SS Header ( flexpipe fixed)
300 cell Cat
RBC
TB Bypass
Hondata heatshield Gasket

Might be time to dyno again think...