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#11
10-13-2021, 01:13 PM
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The HJS cats sound like a good alternative to stock for a better sound and a more free flowing setup. Is there a concern that it will screw up the down-stream O2 sensor and throw a Check engine light?
Let us know what model of cat you ended up with, how the install went and if there were any issues. I don’t know much about exhaust, but I do want to upgrade it in my 4.4i to 4.6 swap for a better sound and maybe a little power bump. I thought I read that there was a right amount of back-pressure for best torque on a motor?
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Current Original owner 2002 E53 X5 4.4i to 4.6i swap 2026 G80 M3 6 spd 2025 G06 X5 50e Former 1972 Audi Fox 1986 Saab 900S 1996 BMW Z3 1998 BMW E36 M3 Sedan 2004 BMW E46 M3 2006 Audi A3 Quatro 1993 Mopar 318 Jeep Grand Cherokee 2015 V6 Jeep Grand Cherokee 
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