I am Jeff

You should message member "xtyper". He had both MBH and MHP headers with 200 cell cats. I believe he was able to pass emissions. If that's the case, you're good to go.

GRam

Jeff,
You CLEARLY are a bad influence Appreciate the pm's/insight, and putting me in touch with Michael. Just in the order process now!!
LTH, x pipe mids, and cats coming my way for a spring delivery!!

I am Jeff

Lolz..I'm here to share the joy with all the C63 members on the forum. You will soon understand why I'm so thrilled about my LT setup. When spring comes, you will be thanking me and have that ear to ear smile!


Let me know if you have any questions with your install.

GRam

Oh have ZERO doubt it will all be worth it..
Won't be tackling the install until April or so, when the roads clear off.
Long time to wait!! Will get ahold of EC to get my updated header tune as well… C'mon spring roads!

w204nyc

Jeff what tune do you have?

I am Jeff

Spring is right around the corner!

I am still running the EC V5 tune. The butt dyno after the header install definitely told me that I gained quite a bit more torque. That and the constant blinking of the traction control light even at highway speeds. I'm waiting for the weekend to try out the header tune file. I haven't been able to get on the gas for fear of running lean up top.

itzjonjon69

Damnit Jeff.... now i want headers! Quick question for you i didn't realize these headers incorporate 200 cell cats, so after install once you fired up the car did you get a CEL from the headers?

I am Jeff

The 200 cell cats were optional, but I didn't have any CEL after startup. So I'm happy about not having to worry about OBDII inspections.

I am Jeff

I haven't had a chance to make a video of a cold start for my car, but I found a video of one that Jellis had previously made. This should give you an idea of how fantastic if sounds right now.

glennhl

ARH does great work, thanks for the info. The other popular header (4-2-1) made in Phoenix looks like the mid pipe will not clear the cross member because one member posted a photo where his installer flattened the mid pipe so they could put the cross member back in.

ld63

Yes, and I recall most folks responding negatively to the installer bending the pipe like that.

Interesting that this pipe is designed with a bend in it for that cross bar - I wonder if there are any trade offs to having the bend there.

I am Jeff

Yeah, I definitely appreciate the attention to the details. My thought process is that if I would prefer not to remove something that MB has put into place.

If there are any noticeable trade-offs, I haven't felt it. The bend is an angular bend, so there aren't any sharp disruptions in air flow. I recall some users complaining about the lack of low/mid end torque when they went with a straight pipe design.

Wobble64

I do not care for the raspiness of the car in the video, but from the descriptor, he does not have the stock resonator. I have heard from several, that the stock mufflers without resonator are too loud with headers. They are designed with the stock manifolds, 4 cats and resonator in mind. Both Akrapovic and Eisenmann are a little quieter that stock mufflers apparently and a better choice when the resonator is removed.


My install is happening today - I will know first hand how it sounds by tonight! MHP headers, 200 cpi2 cats, x-pipe, stock resonator, stock mufflers.

jellis102.com

I would like to hear the difference in exhaust notes between mine and of those of you who are now running the ARH headers, true, I do not have the resonators along with stock mufflers, I love the sound and like it loud, coming from several cammed late model sports cars, its isn't quite as loud though (Z06 vette, 2 GTO's, G8GT) all having plenty of go fast bolt ons added, they were quite a bit louder than the C63 IMO.

My vette sounded the best with ARH headers, catless mids and the stock Ti mufflers, my most favorite sounding car to date, bar none, you just can't beat the sound of the cam humming and screaming through those beautiful Ti mufflers.

Mort

Here is a short vid of my C63 for a comparo. I have MBH headers with catted mids and x-pipe to stock resonator and mufflers. Sorry not sure how to embed the link.


http://smg.photobucket.com/user/JMor..._2334.mp4.html

I am Jeff

Hey Mort - your vid isn't loading.

Wobble64

Did my install today, including dyno runs before/after.


Results:
before (2014 C63 507, EC V5, ROW & AFE filters): 412 whp/380 lbft torque
after (with MHP headers, 200 cpi race cats, x-pipe, stock resonator and mufflers): 447 whp/420 lbft torque


Interpretation: These are Dyno Dynamics numbers (also called heartbreaker dyno). According to many comparisons I found, Dyno Dynamics read 10-15% lower than the more common Dynojets. Using a 13% increase to get to Dynojet comparable numbers, and 18% drivetrain loss, I would have these 'Dynojet comparable' numbers:
447 * 1.13 = 505 whp and 505/0.82=616 crank hp with headers
412 * 1.13 = 466 whp and 466/0.82 = 568 crank hp w/o headers.
Gain from headers: 39 whp (48 hp crank)
If those are real, then my car would be unusually strong, it seems. However, the most important number is the power increase from headers - just under 40 whp/50 crank


The car is much more alive and jumps at revs more than before. The V5 blips are more like explosions. The sound is also very different from stock. Much less deep rumble, more trumpet. A healthy dose of Ferrari thrown in on top of the AMG. More race-car. I still need to get used to that, not sure I like it. Definitely only a sleeper car at <3000rpm.

abcut973

^ Nice

GRam

Wobble,
Be running that exact same setup, from tune to lth/cats etc. Real promising results! Trying to find a trusted dyne source over here on/near the left side of Canada.
Anyone with a shop to recommend in BC/AB/Washington state?
Thanks in advance!
G.

SL55_Forever

Do these come in ceramic coating?

Wobble64

No they are not coated.
Ceramic coating is a mixed bag, I think. You can keep some heat away from engine bay internals, but is this really needed? On the other hand, exhaust gases stay hotter longer, which leads to higher gas speeds in the exhaust and directionally higher flow resistance. Plus, if you bang the header, the coating can crack and chip easily.


In short, I will only consider, if I see thermal issues in the engine bay.

Wobble64

Here is a video from my header dyno runs yesterday. Holy cr..... I did not know it really sounds like this outside!


https://www.facebook.com/turninconcepts

glennhl

Ceramic coating is not really needed for any 300 series stainless headers. The 300 series stainless has a much lower thermal conductivity than 400 series or carbon steels and 300 series does not rust.

I am Jeff

Holy cow! That sounds ridiculously awesome! It definitely sounds more race car like than raspy.

rentzington

wow that is indeed loud!
are those stock exhaust pipes? looks a little squared in the video