I didn't want to mess with CEL and future issues with any smog tests here in WA or where I live (never in the Socialist Republic of CA.)!!!!!!!
I am going FA20Club w/CAT. I dropped the 2nd CAT on my Invidia front pipe, but for noise control added a resonator in the hope it would drop a few db.
Quote:
Originally Posted by FRSBRZGT86FAN
2 Cats, one primary and one secondary. The primary cat is important its connected to O2 sensors before and after it, the secondary can easily be removed without a CEL (hence a catless headerback exhaust can gain 10-20 hp), because that catalytic converter (secondary) is not connected to the car electronically in any way. The reason some people want catted headers is that they don't want to go full catless for whatever reason so they can run catless headerback.
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'13 Ultra Marine 6MT:AVO Stg 1.5 T, Berk Tech Cat'd FP, Perrin OP & 2.5" cat back, WinMax W3F/W2R, 18x8.5et44 Rota, 245/35R18's, Drift-Office EcuTek Tune, Cusco Strt Twr & Rear brace and Grimspeed hood struts.