GL63 AMG and GLS63 (X166, X167) 2014 - present (Two generations)

Downpipe fitting cost / difficulty?

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Old 02-24-2019, 09:58 AM
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2014 Mercedes-Benz GL63 AMG
Originally Posted by Johncy2000
Will Rado 300cell cat downpipes pass smog in CA?
if it’s done via obdii only it should. Stock ecu and no tune, no cel or any error codes. They were installed at the dealership.

no smell, no cel.

for your year car I don’t think they use the hose attachment to the exhaust? Call worldmotorsports they should know as they are in California.

oem I think is 500+ cell.

one if the largest sound improvements were from the downpipes.
Old 02-24-2019, 11:25 AM
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E55, GLS450, GL63, GLE350
Will not pass visual if they look.
Old 02-24-2019, 11:26 AM
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Originally Posted by BlownV8
Will not pass visual if they look.
how does that work in California? I’m not there so no idea. They can tell aftermarket downpipes from stock?
Old 02-25-2019, 01:23 AM
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Most smog shops don’t even do a visual under the car. Just under the hood.
Old 03-23-2021, 02:38 AM
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GL63
Originally Posted by jimxms


Argh, don’t say that to me. Looking at the website this is what I ordered:

Turbo downpipe kit Right - Left (Replaces catalytic converter)
Cod: 849411

To be installed as a kit with 721303 or 721313 or 721323

Centre pipes kit Right - Left
Cod: 721313

Alternative to 721323 or 721303
To be installed as a kit with 849411


The center pipes make no mention of needing to be installed with any other components, so I took that to mean they bolt to ge OEM backbox.

Maybe be I should call to check on Monday 😯
Did you get a check engine light due to the oxygen sensor reading a non OEM downpipe?
Old 04-01-2021, 11:04 AM
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Originally Posted by Aldrich Chan
Did you get a check engine light due to the oxygen sensor reading a non OEM downpipe?
Hello there, yes you will get a CEL triggered. If you are not looking for a performance ECU tuning then you can tell your tuner to remove the values so no CEL comes on.

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