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Exhaust/muffler

Discussion in 'The Garage' started by paul86, Jun 20, 2005.

  1. paul86

    paul86 Newbie

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    Location:
    Portland, Oregon
    what should I replace my stock 86 305 with....Flowmaster 70 or Magnaflow?
    Want to change from fron to back with new pipes/cat and muffler...no more than $500 though!
    It need to open up and have more power (yeah I know it's a 305)
     
  2. gravdigr

    gravdigr 1/2 ton status

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    Location:
    Tyrone, PA
    Actually it has been my experience that the 305 doesn't need much breathing. The PO of my '86 had duals with flowmaster 40s. I had to remove then and go with single exhaust for emissions. I put on a thrush turbo muffler and cat with 2 1/4" pipe and actually gained power, especially on the low end. Don't ask me why.
     
  3. wubba_65

    wubba_65 Registered Member

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    Location:
    Alberta, Canada
    Smaller engine is slightly higher reving (makes power at higher RPM) and the back pressure helps it make more power. Similar to how smaller 4 cyl engines with a turbo need to have a matched exhaust (but 4 cyl much more vulnerable to wrong combination than a bigger NA engine).
     

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