R wagon Posted September 26, 2008 Report Share Posted September 26, 2008 Hey guys, I plan on doing an exhaust on my c70 very soon. I plan on getting a 3 inch downpipe and want to replace my cat with a high flow one. I understand that there is an O2 sensor on the cat so I was wondering about the different ways I can make a high flow cat work without getting a code. Also what is recommended for cats company wise? ThanksBen Link to comment Share on other sites More sharing options...
--Aaron-- Posted September 26, 2008 Report Share Posted September 26, 2008 Magnaflow makes some really nice stuff man. Link to comment Share on other sites More sharing options...
7 VII 7 Posted September 26, 2008 Report Share Posted September 26, 2008 there are two O2 sensors... one before the CAT which is used for A/F ratioand the 2nd is after the CAT that lets you know if the CAT is bad. (you do not NEED this one) but it will throw a codepeople have created Spacers for the rear o2 sensor so that it does not read bad.I think a post in the last week had information on a O2 Spacer for the catlinklinklinklink Link to comment Share on other sites More sharing options...
sconeman Posted September 26, 2008 Report Share Posted September 26, 2008 Hey guys, I plan on doing an exhaust on my c70 very soon. I plan on getting a 3 inch downpipe and want to replace my cat with a high flow one. I understand that there is an O2 sensor on the cat so I was wondering about the different ways I can make a high flow cat work without getting a code. Also what is recommended for cats company wise? ThanksBenmagnaflow FTW Link to comment Share on other sites More sharing options...
7 VII 7 Posted September 26, 2008 Report Share Posted September 26, 2008 wow that looks sweetso for a 3" there is a lot of drone on cruising speed... how do you get rid of that? Link to comment Share on other sites More sharing options...
sconeman Posted September 26, 2008 Report Share Posted September 26, 2008 wow that looks sweetso for a 3" there is a lot of drone on cruising speed... how do you get rid of that?thanks. 2 mufflers, It's the rear one that did the trick: a big 5"x8"x18" oval..no drone : ) Link to comment Share on other sites More sharing options...
7 VII 7 Posted September 26, 2008 Report Share Posted September 26, 2008 I only see one muffler there Link to comment Share on other sites More sharing options...
sconeman Posted September 26, 2008 Report Share Posted September 26, 2008 I only see one muffler therethe second is under the rear seat Link to comment Share on other sites More sharing options...
B Mac Posted September 26, 2008 Report Share Posted September 26, 2008 Ben you've seen the cat I have in the garage right?? In the big "jegs" box. I got my first 3" cat for like, 70 bucks, magnaflow. When it got shipped to my house the internals were in pieces, so jegs sent me (next day) a spun cat (like sconemans) for only 10 bucks more and they ate the overnight saturday shipping. Lemme know if you need help piecing it together and getting it welded. Link to comment Share on other sites More sharing options...
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