xtyper

So I got my headers and tune installed last week at ACGSD, however I ended up with another MBH setup instead of the originally planned MHP setup. Although clearly a quality product, the MHP headers proved too loud for my daily driving habits. James happened to have a quieter catted MBH system in stock that I went with instead. I was really looking forward to trying out the MHP setup, but I know you can't go wrong with either vendor. For the tune, Cory sent over a Kleemann file matched for the headers that James installed at the same time. The car felt great during the long drive home from SD to LA.

So in my usual fashion, I ran off to the dyno the next day to see what kind of power the setup made. Attached are my before & after dyno results, the first graph showing peak numbers, the next showing ambient conditions.

Run 3 = stock except for AFE Pro Dry filters and charcoals removed
385whp/375wtq

Run 6 = charcoals removed, AFE Pro Dry filters, MBH headers, MBH catted midpipes, Kleemann Stage 2 tune, 91 octane Chevron fuel
463whp/419wtq

Overall I am very pleased with these power results, especially given that the midpipes have 300-cell cats. Anyone have an idea how much whp that is costing me compared to catless midpipes?

Next test will be Mo's private track rental.

MBH motorsports

Off the top of my head, cat vs catless is about 13whp on our dyno.

SonnyakaPig

Great results!

Out of curiosity, you don't hear any pinging on 91 octane with the differences in AFR's at certain points in the rpm band?

Sincity

Not a bad sacrifice to give up 13 WHP for some sanity in the morning and WOT.

Sincity

Where did you dyno at? I am very curious to see if I am able to hit 445-450 WHP with my K2 and X-pipe. I hit 421 and change with just K1 and "ROW" box tops with K&Ns.

Faris63

Thats really good gains

jacob502

WTF???

you ordered a new set of MHP headers to end up installing a new set of MBH?

werent you runing with sport cats previously when you mde 470WHP? why didnt you just get a catted system from MHP?

I have an SL63 equipped with the MBH headers runing without cats. IT IS LOUD(check it out in my profile). Same loudness of the MHP headers if not louder. All that loudness is reduced when cats are installed including MHP.

I dont understand, why did you sell your previous set of MBH headers?

PetroC63

Very nice gains Eric!

_AMG_

The cars lookin stout Eric!
So what happened with the MHP headers?

xtyper

I always dyno at Specialty Z in Chatsworth. Great couple of guys over there and very consistent, reliable dynojet. I highly recommend them.

Faris63

Is that on 91 pump gas ?

xtyper

No, so far absolutely no pinging on the dyno nor street running 91 octane Chevron fuel.

xtyper

Yes.

xtyper

No, I was running catless, resonated midpipes when I made the 470whp on my 2010 with the MBH setup. But keep in mind that was on a different dyno (OE Tuning's Dyno Dynamics). On this dyno, that car's best run was 460whp/412wtq SAE. So if I were to swap out to catless midpipes, I've got to think this car is about 15whp stronger than my prior 2010 car, all things equal.

Had I known the MHP headers would prove too loud, I would have kept my old MBH headers and simply reinstalled them on my current car rather than sell them to fund the MHP purchase.

_AMG_

What happened to your MHP headers?

xtyper

James at ACGSD will be reselling them for me. Anyone interested feel free to contact him directly.

SonnyakaPig

That's very cool.

Maverick1975

Those sound like some spectacularly strong results, well done!

hotrod182

We need to get that beast on the Vbox. PM me and let me know when you are around one of these late evenings/early mornings.

C63newdude

WOW!! just hard to believe what I am reading. Got MBH headers and a previous tune which was making a killer whp and torque, then sold the car and the other stuff and ordered MHP long tube headers. In the process you decided to change the MHP and go back to MBH and also try Kleeman tune. Also went and got a newer C63 AMG in the process...
What is next? changing the exterior color of the car? I am not blaming you, I am just trying to keep up with your updates. I thought that you were solid on the MHP.
At one point I was 50%/50% on MBH and MHP but Andy gave me real disccounts and real answers with no delay, when in doubt of a product that makes a difference..

I might have to add some cats or resonators to mine, I bet mine will be as loud(I have a catless MHP LTH waiting to be install this weekend.

Maverick1975

These engines are stratospherically loud with longtube headers and no cats. The neighbours will be sick to death of you!

xtyper

Good luck with your install Carlos. I'm sure you will be very happy with the MHP setup. Believe me, if I didn't drive around my 3-year old so often, I could deal with the additional noise and would be running the MHP's with a big grin on my face. But that's not the case and even though I knew this when I ordered them, I had to test them out firsthand and see for myself.

C63newdude

Andy,

^^ Same here with the 3 year old.. but couldn't you get some High flow cats installed or some silencers? I mean, you already know that all LTH are very loud without cats, I think that Andy sells an option to keep them quieter by having silencers or HFC, I am just saying...
I am the same way, I like to try myself before anything else, unfortunately there is not a single tuned or modded C63 in Tucson, the few owners wouldn't even go with me to test their stock C63 at the local track so here I am also guessing how loud the exhaust is going to be.

It is very likely that I will end up installing a set of HFCs to buffer the sound.

bhamg

Well IIRC I was the first C63 on your dyno with a swappable system and we got around a 19 rwhp between test pipes and CA-legal aftermarket cats. Were my (fairly restrictive) cats the same as what xtyper got? Glad you are still in the family xtyper!

MBH motorsports

I was trying to dig up your dyno chart. It for sure is something in that range