Help - Engine making weird noise above 4000 rpm near full load

[sbviper]

I have a 98 Viper GTS. Near end of my last track event it started making a weird noise above 4000 rpm near full load. No noise at all below 4000 rpm even at full load. This is very repeatable.

video link (not my account):
https://www.facebook.com/1000227137...886538033/?type=2&video_source=user_video_tab

Notes: Has ~50k miles. I have a roe supercharger set at 5 psi. Have had for years. I have changed spark plugs, no help. If anyone has seen this issue before please let me know. Took it to a local shop and they couldn't figure it out either- they recommended taking to a place with dyno to make easier to reproduce in a shop setting. Also interested in a good place nearby to get the issue fixed (I live 45 minutes south of Indianapolis). Can sometimes get to happen briefly during neutral throttle snap, but is very sporadic.

 

[Steve-Indy]

You might give me a call when you get a chance.
317-402-9013

 

[Steve-Indy]

Good to speak with you.
I spoke with Tom Sessions, and sent him this link.

 

[jrkermode]

Hard to tell exactly from the video, but, I occasionally get a similar sort of noise from my Gen 2. Ted May (very experienced Viper tech) traced that to a resonance (rattling) in the heat shielding around the side pipes. Try thumping the rockers with the your sneakers and see if you hear the same sound.