Actually 3" exhaust is much quieter to 2.5" so I can see why he put the 1 chambers on there. If I put one chambers on my car (1) I would go deaf and (2) every cop for a 10 block radius would be looking for me.
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1994 Mustang Cobra
308ci, Vortech S-trim 11#, ported GT-40 heads, E-303 cam, FMS 1 5/8 headers, BBK Offroad H-pipe, 2-chamber flows, and several other goodies.
Rebel Racing. Home of Bay Area Mustangs