Hey Guys
I have a question that hopefully Allen will chime in on, I am thinking about removing my cats, I have a hypertech, (A Nelson tune coming soon), but I was thinking, with out having a good tune, and not having the rear o2 sensors turned off am I going to lose performance because of the rear 02 sensors reading incorrectly and the pcm trying to adjust for it. I just want to make sure I don't mess up by taking the cats off. Anyone done this with out a tune???
Thanks
No, you wont loose any performance. The rear cats only throw a SES light to let you know something isn't right. The front O2's are the ones that control the A/F mixture and timing.
I'm not allen, but hope this helps.
2000 RCSB Z-71 6l swap 12.8 Gone but not forgotten
2008 CCSB "tow truck" Slooowwww
1999 RCSB "WRK TRK" 4.late but getting there.
You wont lose any performance, I took my cats off and all Allen has to do is turn off the rear o2 codes, I also removed my EGR and had the codes removed from it.
Chris
2009 Silverado, HPTuners, all stock.
Also, don't expect big power from dumping them. Maybe 5-7rwhp at the top of the powerband, these new stock cats flow pretty well.
The superior man is modest in his speech, but exceeds in his actions. - Confucius
"He who asks of life nothing but the improvement of his own nature, is less liable than anyone else to miss and waste life."- Henri Frederic Amiel
'01 Chev Z71 LT - '85 BMW 745i TURBO - '88 BMW 750iL - '88 Ford F150 XLT Lariat - '79 MB 240D - '79 MB 280S Euro
'80 MB 380SE-5.0 Euro - '85 MB 300SD - '87 MB 300SDL - 1990 MB 300SEL - '91 MB 300SE - '91 MB 560SEL
Let's face it, the red hair... makes 'em wet.
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