Deceleration exhaust rattle

[Gr8ful]

I have an Active GT S650. I installed the Rouch H pipe. The sound perfect in all modes.

BUT.

When in any mode other than quiet, during deceleration, I can hear tinney rattling sound. It's very odd and annoying. Again with valves closed no rattle.
I thought maybe a lose valve but had someone rev and decel while I pressure a long screwdriver against valves. No difference. All clamp tight and secured with no touching anywhere
I have been installing aftermarket and free flow exhaust for 30 years and this is a head scratcher.

Any thoughts.
Thanks

Sponsored

 

[LouG]

Does it rattle if you shake the system with engine off?

 

[Gr8ful]

No. Tight as a drum.

 

[sloww5ohh]

Mine does the same thing with the exact setup you have. I believe it’s just a characteristic of the h-pipe, very weird but at least it sounds epic 99% of the time haha

Sponsored