SL55/63/65/R230 AMG: SL55 Deep Exhaust
#27
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Join Date: Dec 2008
Location: Nottinghamshire UK
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SL55 AMG
I didn't want to take out the primary cats, cause of the simple fact that the o2 sensors are right there, and also because that could be a major issue with smog. I took off the secondary cats, because it's very easy just to go back to any muffler shop, and have them weld them back on, also I took out the resonators for deeper, and louder sound, as for the cats off, you get better flow, I also think with them off they give you better the sound.