I got a ticket last year, so I put it on the dash-no problem since.
I research NJ law(title 39), it does not expressly forbid being on dash, and I can remove it for shows!!!

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Ken - cousin from Skyroadster.com

Mean Green Wolverine
'07 Redline Green/Tan/3 pedals/1 CD Monsoon/Spoiler
Ordered 6/6/06 Del. 4/7/07

Dejon IC, Pipes & Intake
Magnaflow Exhaust
Wastegate mod/nanny valve bypass