Objectionable

I'd expect Renntech headers, even with otherwise stock exhaust to yeild some power gains. What I need to know is if the exhaust is much louder? I wouldn't expect it to much, if any louder, but hopefully somebody can tell me from experience.

As always, thanks in advance.

grantwoodtx

I did my headers last week. I got EVOSport shorty headers. Not a noticable change in sound just a low end rumble I never heard before.

I am getting CATS and RES done this week so I'm sure it'll be a little louder.

Power was noticable from the get go. I did an ECU reset when I got the car home and now I can smoke 'em in 1st & 2nd.

Objectionable

Thanks for the information!!

komp55

I also have done Evosport headers as my only exhaust mod. Definitely measureably better performance, but no significantly different exhaust note.

Roseylv

I too am thinking about headers. I have a pretty tight budget and am thinking about buying used. I'm still looking into Kleeman headers or a used set of Evosport headers

Objectionable

My MB dealer is an authoized Renntech dealer too. No big deal except that if I buy from them and they install the parts I'm in the clear on a warranty claim. I like that peace of mind. The price for Renntech headers installed is $5,405.00. Pretty pricey.

If it wasn't for the warranty I wouldn't think twice about putting a pair of EvoSport headers. My guess is that the EvoSports probably wouldn't void anything, but it's just another layer of BS that I don't want or need.

I'm glad it isn't much louder - I like the way the car sounds now.

grantwoodtx

I got a set of used EvoSport headers from a board memeber here at a great price. It's well worth it to do the headers, the car is smoother and power is noticeable.

aganzon

I have had my Renntech's shorty headers for over 2 years now. I've noticed a deeper exhaust note but nothing too aggressive. The interior noise it creates is also a very slight deeper burble but again not loud. IMHO, it sounds much better that stock but maintains that sleeper persona.

Unfortunately, I can't tell you how many WHP the headers added. I had other mods installed at the same time.

https://mbworld.org/forums/w211-amg/...ties-mods.html

Ghostrider

Have your SA check the price of the Kleemann headers and install.

tylersphile

I have experience with this.

I installed Renntech headers (only, no software tune, etc). I performed a dyno run before and after installation (same dyno, similar temp, barometric pressure, humidity, w/ ECU reset). The results were a slight LOSS in power, overall. My understanding is headers increase exhaust scavenging efficiencies; therefore a drop in cylinder pressure and change in mixture will result. Hence the requirement for a good tune to turn these losses into gains. So, I hate to say it, but it appears from my findings, that ONLY a header install will decrease performance.

Proceeding the above tests, I installed a 178mm pulley, heat exchanger + pump, and respective Renntech tuning. My performance has obviously improved from these, but I am left questioning the influence of the headers. I would like to assume there are performance gains from the headers, when paired with a larger pulley and tune, but I am not entirely convinced.

As for the sound, the headers have added a quiet, yet tasteful, throaty growl. I am VERY cautious and careful in maintaining a refined, luxury vehicle presence, and the addition of these headers has not compromised that. There are a TON of exhaust clips on YouTube, and 99.9% are too much for my tastes.

Hope this helps,

Cheers

guysandiego

if you keep the stock mufflers you wont get much sound out of headers... But you will get great gains -- stock manifolds are the weakest point in our cars --