I know Amuse Dual is NOT designed for F.I. applications,
and few others have reported rattle in resonators in Amuse Dual when they used it with S/C or Turbo.

However, after about 10k mile hard use of my amuse dual, I started to see hairline cracks between pipings and resonators.
This is where Amuse DID NOT spot weld.(no wonder it's the weakest point)

I reinforced this area with applying spot Ti welding, I recommand this for anyone who uses Amuse Dual on F.I. cars.
It got rid of the rattle too

I will post the welding pic soon

 

I heard that happen to alot of ppl

 

Sideways blew out a Amuse exhaust as as well.