Exhaust Systems
 

For a 1986 RX7, if you replace the cat and exhaust system, what are the performance / cost tradeoffs for a dual as opposed to a single pipe system. Seems to me that the dual system would perform better simply because the dual pipes provide better exhaust flow. Any general comments or guidelines ?
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its worth it. i am trying to help my friend sell his rolled 86 na he has a race beat header high flow cat and borla exhaust. it woke his car up! hit my cell if u are intrested in the car 717 903 2652

thats the system i want for my car, borla and high flow cats. Did he have a single cat?