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  1. C

    Is it bad to have a bigger exhaust system on a roatry engine in a 1985 Mazda RX-7?

    I heard its bad because the engine needs the back pressure to run right, does it make me lose horse power. Thanks.
  2. C

    Is it bad to have a bigger exhaust system on a roatry engine in a 1985 Mazda RX-7?

    I heard its bad because the engine needs the back pressure to run right, does it make me lose horse power. Thanks.
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