I had the same exact setup as you, then went back to stock catback. If there is a power difference it isn't noticeable to me. I'm sure I lost a bit of top end power, but I really can't notice.

 

if you have a 2.5 header & 2.5 berk hfc with intake snorkel and then swap out the aftemarket cat back to a stock cat back will it then sound 100% stock or will it sound slightly loudy given the larger header and HFC? anyone got videos to post up to hear the sound ?

 

I swapped back my stock exhaust today and left everything else the way it was. After taking it for a quick spin I did feel like I lost a little bit of power but nothing to complain about I guess. I was nice to actually be able to hear the radio I plan to putting more seat time in this weekend. I'll report back then

 

What size berk HFC are you guys using with the stock exhaust?

63.5mm?

 

^ I currently have a 70mm HFC, only because I had a 70mm exhaust prior to going back to stock

 

X2, the smaller size would mate up better with the stock exhaust piping though. I kinda wish I had the smaller one, but I don't think it makes that big of a difference.

 

I just ordered a Tanabe Medalion Touring yesterday. This seems to be one of the quietest out there. We shall see.