su87bi Posted May 18, 2006 Share Posted May 18, 2006 Got a 1987 Subaru wagon with standard mainfold exhaust and 2inch system after bolt on, looking at putting extractors on with a cat after the bolt on. Any more power will be givin ? Also has hot dog in middle , sounds nice now, hopefully it will sound better, as at the moment standard exhaust off motor resinates , so any sugestions. thanks Quote Link to comment Share on other sites More sharing options...
ausubaru92 Posted May 20, 2006 Share Posted May 20, 2006 I made and tried some equal length extractors, they really only changed the note of the exhaust. After some research, i found that to make each extractor pipe the volume of the cylinder that will fill it. With the ea series motors, with each pipe being supplied by 2 cylinders, i made eack pipe 0.9lts. Im back to using the stock exhaust header and a 2" straight through from the cat back. Some pics Gannon Quote Link to comment Share on other sites More sharing options...
Jerry DeMoss Posted May 20, 2006 Share Posted May 20, 2006 Nice looking exhaust! Quote Link to comment Share on other sites More sharing options...
ausubaru92 Posted May 20, 2006 Share Posted May 20, 2006 Thanks jerry Its a shame it didnt work to how i expected it to. Sure it was heaps better than the stock exhaust, but when i went back to stock headers (cos i didnt have a cat converter on the one i built) i noticed no change in power, just the sound it makes. I now have 2.25" from the cat back with a mercury sports muffler and it rocks:headbang: Quote Link to comment Share on other sites More sharing options...
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