Hi, yes I've also got a Motordyne Shockwave ))) E370 mated to Berk HFCs, and it does fit. No Probs.
Only thing, the Berks are a few millimeters shorter than the stock cats, so you end up pulling the exhaust slightly toward it when you bolt it back onto the Berks. That's all there is.
Just a heads up, the Motordyne has a lovely sound with the stock cats, developing it's most racing pitch at 4000 rpm. When I then added the Berks the exhaust noise went noticably up, so it's proper race car sound now when u open the throttle
, especially around 4krpm. The idle and cruising noise at low throttle are still civilised for unoffensive city drive. It's somewhat comparable to when an M3 driver or Ferrari driver cruises and then suddenly stomps onto the throttle... I totally love it
Enjoy ur new power rocket