dllhg

Have watched a few clips online and they sound pretty damn loud. Was thinking of adding some resonators to tune it back to near stock sound. Rentech even said they stopped doing Catless because too many complaints about noise and smell. I dont care about the smell, used to no cats on previous cars.
Also do you guys know how much heat they add ? Is it a real problem ? Considering wrapping them. No time to coat them.

Also read on here that I should replace plugs. Anyone know the stock part number for the 2014 CLS63 AMG ? Was planning on gapping to .022. Sounds like they went a step colder on the 2014s from the factory. Is it true you really need to TQ them exactly right to fire properly ?


Lastly debating on air filter. Weistec offers a really pricey one for $300 K&N has one for $99 . No MAF sensor to worry about. Not sure if its low profile like the Weistec though.



Appreciate any input or advise from you guys. Thanks !

Stereolab42

Is there really a smell from catless downpipes on our cars? I vaguely recall somebody claiming there wasn't in another thread. I note you're in Cali also. I'm going to research downpipes with the aim of finding some that are easy to swap in/out for smog checks. Anyone have any suggestions? I'm all for noise (since I have remote valve-controlled mufflers) but smell is a deal killer.

Fairbird

no smell in my case . loud ? yeah , awesome !

Pumpkinate

My Eurocharged tuned CLS smells of petrol while idling but I don't find it unpleasant.

Consider the UPD air intake kit, it is a high flow filter and a spacer to reduce resistance to air flow.

Ralcbah

Congrats! I'm sure you'll continue to enjoy it.

This is my first car with catless pipes. I had heard that some folks smell fuel idling at lights or in traffic, with windows down, or when standing outside of the car when it's running...my car checks each of these boxes. I don't mind it, however. Sounds is loud at WOT, but I do enjoy that part.

Good luck with your mods!

silvers2k

+1 echo above comment.

My personal experience and from what I read on the forum, I would change the spark plugs. I'm running stock plugs (stock gap) and planning on replacing them every 10-15K miles. As for filters, I'm running AFE PRO DRY S filters.

gaspam

for catless dp noise, its not loud.. your e55 with lth is louder... I had e55 and c63 with lth and they were both louder (c63 was way louder) than my e63 with dps...

here is my E55 noise on the dyno


and here is e63 with cateless downpipes on dyno at renntech


i dont have c63 dyno vid but it was way louder as you can hear in parking lot vid


smell, a little but again not near as bad as the smell was on my e55/c63 with lth/ cateless

air fiiter forget the weistec one and get the upb cold air intake box spacer filter combo... they have produced real world dyno gains of 15-20 whp and wont break the bank like the ams intake

and yes plugs have to be indexed properly

cocobeex

What plugs would you recommend ?

gaspam

stock plugs gapped to .026 is what renntech recommended me for their tune... i had stock plugs at stock gap for 10K miles with no problem and just put new plugs in as it was time to replace and i gapped them down to .026

dllhg

That thing is WAY louder than stock. I cant believe the cats really make it that much quieter. Did you remove resonators too ?

gaspam

Well keep in mind only the second video is the e63, and its much quieter then the first vid (my e55 ) and 3rd vid (my c63)


Here is my e63 from inside with dps... Super quite except under wot

Stereolab42

What is it about the E63 that gives it a much lower noise ceiling that its pseudo-siblings?

Zod

turbo (2012+ 63) vs. NA (c63)vs. supercharged(55k)

For a turbo car it has one of the best sounds of ant turbo car, considering its muffled

gaspam

because the e63 has turbos that the exhaust travels thru when exiting the engine. the exhaust-side impeller disrupts the exhaust sound wave by creating an extra gate for the sound to have to flow through.

e55 and c63 the exhaust sounds exit the engine straight into the headers straight without interuption

dllhg

That isnt bad at all from the inside. Sounds good.

gaspam

yeah its definitely pretty tame... trust me, your E55 was way louder as i had same EC LTH's you had on my e55 and way louder, so if you go dp's on e63 it wont sound too loud to you... for me, my c63 was too loud and e63 too quite... i think e55 with LTH's/no cats was just the right loudness

dllhg

Got the MBH downpipes in today.Super nice quality. Doesn't include tabs for hangers and the pipe presses up on the under carriage on one side. No rattling or anything inside so it seems to be fine. Will need to add hangers later. I did get a good deal on them so I am not complaining.

Amazingly enough, driving around town and on freeway it doesnt seem louder than stock. When you really open it up it has a little deeper growl inside the car. Outside it was quite loud when they drove by WOT. I never heard it stock to compare. No need to add resonators or anything like I thought I would. I dont hear the turbos as much as some videos I have seen online. Perhaps they had the bridge pipe done as well. I didnt really understand what that pipe was until today when he was putting it in. Looks like it would make a pretty big difference. Notice faster spool and car is more responsive. No real odor issue IMO.

Overall very happy with them on the car.

Zod

Thanks for the feedback mate and glad you are liking them.

I might be jumping off the fence and joining you soon