ParadiseMJ Posted November 5, 2012 Share Posted November 5, 2012 OK, I started my exhaust re-vamp on the 88 MJ. I don't need a monster system, I don't need it to sound "cool". I plan on keeping the cat as is until it stops working, I put in a Flowmaster 40, the cat is good, I fixed all my hangers. I know the manifold is cracked by the collector, which I can weld up...but...it seems all I hear is that the Renix manifolds, crack, or will crack. I will put in a flex portion after I get this all done. So my real question is: Is there an after market Renix header out there that doesn't cost more than my whole truck, OR can I just have an exhaust shop fab up a decent downpipe with the sensor (O2, EGR) bungs. Has anyone modified this section to be smog compliant and still avoid the inevitable exhaust leak?? Link to comment Share on other sites More sharing options...
cruiser54 Posted November 6, 2012 Share Posted November 6, 2012 OK, I started my exhaust re-vamp on the 88 MJ. I don't need a monster system, I don't need it to sound "cool". I plan on keeping the cat as is until it stops working, I put in a Flowmaster 40, the cat is good, I fixed all my hangers. I know the manifold is cracked by the collector, which I can weld up...but...it seems all I hear is that the Renix manifolds, crack, or will crack. I will put in a flex portion after I get this all done. So my real question is: Is there an after market Renix header out there that doesn't cost more than my whole truck, OR can I just have an exhaust shop fab up a decent downpipe with the sensor (O2, EGR) bungs. Has anyone modified this section to be smog compliant and still avoid the inevitable exhaust leak?? I have used the later exhaust manifold with the O2 sensor welded into the upgraded down pipe which is made in two 45* angles to clear the driveshaft and has no "crush". You can have an EGR tube bung welded into the later manifold also. Link to comment Share on other sites More sharing options...
sinkrun Posted November 6, 2012 Share Posted November 6, 2012 This is great to know I need a new one also last one last 3 years about 20,000 miles this is my new winter project. Link to comment Share on other sites More sharing options...
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