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Custom Dodge Ram Performance Mods - Engine - 5.9 Liter V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!


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  #1  
Old 10-20-2011, 10:40 PM
WhiteLightning98 WhiteLightning98 is offline
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Default Bypass Cat

I was wondering if anyone here has bypassed their stock cat, im looking for some cheap upgrades and figured it might be worth a shot. (already have a CAI) Even if there was no power increase is there a negative impact on low end power?
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Old 10-21-2011, 07:20 AM
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the easiest way i've found to bypass the cat is to cut one side out, bust the catalyst out, and weld it shut. it wont pass emissions but it still looks legal from under the truck.
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Old 10-21-2011, 11:40 AM
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jegs sells a catless y-pipe for around $150 and summit racing sells bolt on headers for around $200
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Old 10-23-2011, 08:59 AM
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u could definitely bypass the cat, but id probe in an o2 sensor
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Old 11-05-2011, 10:40 AM
WhiteLightning98 WhiteLightning98 is offline
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Thanks for the advice im going to try to drop it bust out the guts and reattatch. Will post back results.
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Old 11-07-2011, 08:27 PM
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You may throw a code if you don't get an O2 simulator. I bypassed the cat on both of my old 5.9's. First time i didn't do the O2 sim and threw codes (it was a DIY job). 2nd time I had my exhaust guy do it and paid to have him put an sim on it and no problems at all. Driving it home I couldn't believe the difference it made! I was impressed.
To answer your other question, I didn't notice any low end loss at all on either truck.
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Old 11-07-2011, 11:59 PM
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my truck doesnt throw any codes with the headers and catless y-pipe
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