Hey Gang,
I have the latest MHP V3 tune and TCU coming sometime this week. I am going to dyno it when it arrives and then provided it shows an increase I will head to the track.
I already know what the MKB tune provided on the dyno and track so this will be a good side by side comparison. It will be the same dyno, same 100 octane fuel, same everything. The only thing that will be changed will be the tune. Stay tuned for further developments.

God Bless,
Keith

 

 

so you have the mkb headers and downpipes and now going to add it with the mhp tune correct? really looking forward!

 

I noticed that the MKB headers with down pipes, have deleted the cats.

To compare, Renntech & VRP keep the stock cats while Kleeman changes to 200 cell metal cats.

Deleting the cats helps add any where from 15 to 25 hp to the car.

 

if thats tru you will have 1 veryfast car

 

I do have the MKB headers and down pipes and I also eliminated the secondary cats. The primary cats are left in place and are stock. The resonator and mufflers are all left stock. All these mods were done with the testing of the MKB set up. The car dyno's consistently between 440 - 448rwhp and 395 - 405rwtq with the MKB set up and my signature has my best 1/4 mile times listed. I will keep you posted when the ECU arrives and what the testing proves. Talk to you soon.

 

So your saying the MKB headers keep the primary cats in the stock location.?
Or did they have to remount them after the header install.?

 

Keith, are you going to run it Wed night if the ECU arrives?

 

MachC5,
The MKB headers leave the stock primary cats right where they are. Nothing moves. The headers are above them and feed into them with the new down pipe. You do cut the front of the stock cats off at a 3" diameter and weld the new 3" down pipes to them. That eliminates the very small 2-1/4" restricted stock down pipe. The headers alone with the stock tune gained over 30rwhp.

HHughes1,
I am going to try to make the track Wednesday night if the car is back from the body shop and the ECU is here. I will advise.

 

[QUOTE=Dads C63;3321355]MachC5,
The MKB headers leave the stock primary cats right where they are. Nothing moves. The headers are above them and feed into them with the new down pipe. You do cut the front of the stock cats off at a 3" diameter and weld the new 3" down pipes to them. That eliminates the very small 2-1/4" restricted stock down pipe. The headers alone with the stock tune gained over 30rwhp.

So the headers / down pipes by them self are worth 30rwhp above what ever the ECM / TCU can give you correct?


-Troy

 

[QUOTE=Glock Guru;3321660]One of the things we found during the full exhaust fab of our C63 was that the OEM exhaust manifolds actually neck down to less than 2 inches. We expect some pretty large gains with exhaust on these cars.

 

The headers alone gained over 30rwhp. see attached graphs.

 

Andy,

For longevity purposes and others who do not wish to use tube headers, are the exhaust ports on the manifolds from the other 63 classes larger? And will they bolt up to the stock downpipes?

 

Honestly the best way to see what 63 uses what manifold, or if they're all the same is to check at the parts counter. I'll send an email to my guy now. Remember it's not the port/flange size that's the issue though, it's the neckdown in the collector.
There may be minute differences in diameter and some bends, but then again to save $ maybe not.
Reg. longevity, what did you mean? All our systems are 304 stainless with a lifetime warranty on all parts, meaning they will outlast the car.

Thanks!

 

I have added pictures of the MKB shorty headers and the difference between the stock manifold down pipe and the MKB down pipe.
Believe it or not the two down pipes are right next to each other. Now you can see why the exhaust has huge potential.

 

Great comparison shots Keith, really highlights the difference and how bad the OEM manifolds are.

 

Now you've got me salivating...I can't wait to see how much harder this beast pulls when she can breathe out of a new MHP exhaust system!

 

Are there any O2 sensors for the secondray cats?

What I really would like is a system that deletes the primary cats and keeps the secondary ones or replace them with high flow cats like the Supersprint exhaust system for the E55 and BMW M5/M6.

MHP what will your exhasut system would be like?

 

Guys,
Got the ECU back and now waiting on the car from the body shop. Hopefully it will be complete this afternoon and I can get it on the dyno. Will advise as soon as I can. Waiting on the body shop to call.

Keith

 

Cant wait!!!! Hope you will get some real nice gains

 

Can't wait to hear how the exhaust sounds with the tune...

 

1 7/8" Longtubes with 3" high velocity merge collectors, 3" metallic substrate cats (100-500cpi your choice) and/or off-road mids, 3" X pipe, 3" resonators, 3" mufflers (your choice of straight through or baffled). All 304 Stainless with a warranty on everything.

or

Same LTs as above with cats or o/r mids that mates to the stock catback.

or

catback that mates to the OEM manifolds.

 

No dyno tonight. Will be tomorrow. Body shop wasn't done.

 

Stupid body shop. You tear off almost the complete front end of the car by sideswiping on little light pole, and they can't get it fixed in one week..... Somebody needs to tighten up.

 

Sorry it wasn't done today...... we'll all be waiting for your results tomorrow