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whats up everyone. New to the forum and e63. I have a 2010 e63. was thinking of removing primary cats instead of secondary ones. i feel the secondary cats flow good and people gain about 5hp. I am planning on cutting cats off right after first o2 sensor. weld straight pipe with bungs and o2 90 degree spacers. so far i did resonator delete with x pipe there, not loud at all. charcoal filters removed no check engine. after all this custom tune. i had a bmw 650i gran coupe stg 2 catless had 90 degree spacers no check engine. it would come and go.
Last edited by fation; Jul 2, 2021 at 01:05 PM.
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Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
