cat remove
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Joined: May 2008
Posts: 12,139
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From: Houston
2003 W211 E55, 2003 W220 S600
i got rid to the secondary cats and the resonators. I put a 3 inch straight pipe instead, it was a bad decision because i lost low end torque, both the banks were independent.
now i have put a x pipe in the system and the car has regained the torque.
you can remove the cats and factory H pipe but make sure you put a x pipe as close to the headers as possible.
now i have put a x pipe in the system and the car has regained the torque.
you can remove the cats and factory H pipe but make sure you put a x pipe as close to the headers as possible.
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2009 ML 63
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Joined: Sep 2009
Posts: 346
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From: Arlington, VA
E63 AMG
I just had my secondary cats and resonator removed on Monday. I honestly don't feel any difference but the sound is a vast improvement. Definitely more growl coming out the back but still quiet inside the cabin. I decided against the x and h pipes and ran 3" straight pipes. I was beating my buddy with a stock E55 at the track on Tuesday so I'm not worried about "losing" anything.
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Joined: Sep 2004
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CLS55 AMG & RRS S/C
im just wondering why the x pipe should be closer to the headers.
does it really make more tq if they are closer to the front?
im running a catless system and my xpipe is near the back, in place of the resonators.
is there anything wrong with having it that way?
does it really make more tq if they are closer to the front?
im running a catless system and my xpipe is near the back, in place of the resonators.
is there anything wrong with having it that way?
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From: Arlington, VA
E63 AMG
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Joined: Apr 2009
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From: Lafayette, IN
2008 ML63 2009 SL63 2010 Alpha 7 GTR
stock H pipe is below the "headers" and right before the secondary cats. I cut my secondaries off in between the H pipe and cats. And put in straights. No loss in torque. Im putting down over 550 rwt with my mods 
