paj

Installed yesterday and dam this is awesome! Awesome sound from a non PE car! The sound was even better after my 1.5 hour drive home!

DustyAMG

Just ordered these downpipes myself! Great thread!

VTSummit

I'd love to get a sound clip from a non-PE car with an intact, stock exhaust. So tempted. Wasn't planning to do downpipes due to cost, but this is a pretty sweet deal.

DustyAMG

I got mine installed and for the 1st 50 miles I got no check engine light then it popped on while driving. I stopped by the parts store and they pulled the code and getting the P0430 Catalyst System Efficiency Below Threshold (Bank 2), P0420 Catalyst System Efficiency Below Threshold (Bank 1).
Anyone know a work around? Will a tune fix it? The downpipes are on a 2018 C43 Coupe

The pipes are awesome! It really gave the C43 more power, spools faster and sounds super rad!!

SilverBullet18

Get j-style spacers. Clears it up or ask them to show you wich ones. Plenty of members have used the setup.

DustyAMG

Nice, ordered! Thanks!!

SilverBullet18

make sure they are the ones with adjustable gas flow inserts. And use the middle sized hole one.

(There are usually 3, small hole,middle hole and large hole one)

DustyAMG

Do I need to get them for all 4 O2 sensors or just the ones on the cat part of the downpipes?

SilverBullet18

No just the downstream 02 spacers (so youll need 2). Ask LEM for a pic I think another member had the same issue

DustyAMG

Ok cool, I seen a few things online, looks pretty easy to swap in. $36 each isn't too bad!

shaungrey

Do these downpipes require a tune to avoid losing power compared to stock? Specifically asking about Facelift version of the C43. I understand running a tune will maximize gains, but I prefer to keep that side of things As is for now.

tgidave

i believe their latest "Stealth Series" do not require a tune.

LogosMotorworks

The stealth series downpipes provide just enough balance to keep things in check- we have some customers running them (pre-FL) without a tune. Also remember that JB4 with a custom map 6 will do th trick in taking you to stage 2.

here is our stealth series: https://mbworld.org/forums/c450-c43-...-cel-free.html