Chuck:
This has been a learning curve for me as I attempt to reduce the dB level with my side pipes, so I am still in the early " Learning " stages. All references I have seen on the use of Vortex cones has been to insert in the header collector for maximum benefit. Also, ( I think ) the HP, cam , etc of the engine does/could impact the reduction in dB. Car Chemistry discs have also been referenced for the same placement, i.e. in the header collector.
http://www.secureperformanceorder.co...re/vortex.html
You might want to consider contacting John at Dynatech for his opinion:
John Gaston
Sales/Technical Support
Dynatech Headers
www.dynatechheaders.com
jgaston@dynatechheaders.com
800-848-5850 Ext. 271 Phone
812-751-5513 Direct Phone
I would be interested in his response
Don