spudsAMG

roadkillrob

Wow, @BLKROKT is usually quicker at answering these questions - hold on he will get to you.

BLKROKT

spudsAMG

?? So what is it

BLKROKT

Funkwagen

An ECU tune

Sick AF

Hahaha

it's a never ending battle, but you've put up a good fight

G_Money

MBH Motorsport or America Racing for headers. As far as intake they are very expensive for very marginal gains. I think the Renntech CF airboxes set the benchmark tho.

Gsrchris

RENNtech intake's available if you are interested:

https://mbworld.org/forums/c63-amg-w...take-m156.html

Will include brand new air filters for free.

Doc Oc

While headers seem to be the popular choice around here you can get similar gains for about half the price by going with upgraded log manifolds and fully catless mid-pipes. I gained 36 rwhp with that combo and spent less than $1500. I wouldn't waste a lot of $$ on an intake, unless you've got cash to burn. Row boxes and filters are fine.

Celicasaur

On that note, I'd really like to see a back to back comparison (which will never happen, i know) of a decatted car vs long tubes decatted. I'm told that long tubes add more power before the peak power point but from what I see on separate cars with either a tune and headers or a tune and a decat...the figures and shape of the curves seem the same

Doc Oc

That would be very interesting. Funny thing is, over on the m3 forums there are several big threads on this same topic. Most of the guys over there just do catless x-pipes or test pipes, and they swear they make the same power as arh long tubes because of the good design of the OEM manifolds. Arh claims otherwise but catches hell for it as they haven't shown much proof. Nick from arh and a few guys over there have been going back and forth on the topic for several years.

You've gotta think there's more area under the curve with LT's vs logs, but I'm certainly not switching to find out That was not a fun install.

skratch77

I have a dyno of my car from just adding headers and keeping same tune on the car. The only thing changed was adding headers. It picked up power only past 5500 rpms so before you all waste 5 grand doing headers I would just do a second cat delete and call it a day.

The bmws have headers installed stock and is why they dont make more power adding them.

here is the dyno on 24 deg timing...same tune etc.The only difference new plugs and new coils as you can see how smooth the curve looks after with headers.On 28 deg timing I would guess 475-480whp but I hit a deer before getting back on the dyno to test new tune.

Doc Oc

This is my before and after

carid

I can suggest checking out the exhaust for C63 made by Akrapovich:

Akrapovic® - Evolution Line Titanium Exhaust System

Specs:
Exhaust Tubing Material: Titanium
Exit Location: Quad Rear
Exhaust System Sound: Aggressive / Loud
Max Power Stock: 447.9 (HP Imperial) / 454.1 (HP Metric) / 334 (kW) / 6400 (Rpm)
Max Power Akrapovic: 456.6 (HP Imperial) / 463 (HP Metric) / 340.5 (kW) / 6280 (Rpm)
Max Power Increase: 11.6 (HP Imperial) / 11.8 (HP Metric) / 8.7kW) / 3550 (Rpm)
Max Torque Stock: 442.5 (Lb-Ft) / 600 (Nm) / 4370 (Rpm)
Max Torque Akrapovic: 453.1 (Lb-Ft) / 614.3 (Nm) / 3720 (Rpm)
Max Torque Increase: 16.4 (Lb-Ft) / 22.3 (Nm) / 3720 (Rpm)
Weight Stock: 86.9 (Lb) / 39.4 (Kg)
Weight Akrapovic: 44.3 (Lb) / 20.1 (Kg)
Weight Decrease: 42.6 (Lb) / 19.3 (Kg) / 49 (%)

DYNO is available here

Celicasaur

I wonder if its something that requires a more aggressive cam to make the most of the better outflow I know that on my celica a decat is worth 5hp...decat with long tube is 15hp but then it does have an angry vtec cam above 6k rpm...who knows

So your before graph was with just secondaries out or were the primaries out also? It really needs to be a full decat (like longtubes) to come to any conclusion...still...better than nothing to see your graph. I think mine picked up 40 from just headers too with a canned V6 tune.

Yeah they're certainly miles better in stock form than our pathetic log manifolds.

Hmm this could be a task if anyone's bored at work...fish out threads of full decats vs headers

That's stock vs headers and tune....?

Again....be nice to see full decat vs headers and on the same tune

Thank you for spamming this pointlessly hi-jacked thread with something even more irrelevant

skratch77

My before dyno was all stock exhaust and both cats and the after dyno is with headers and 200 cell race cats.

my next dyno will be with adding a remus exhaust and more timing.

Doc Oc

That's stock vs headers and tune....?
----------
No, the before run is tune only, after is with the manifolds and cat pipe. Never dyno'd stock unfortunately.

Vladds

So headers, all 4 stock converters removed and replaced with only two 200 cell race cats.

What do long tubes do with 4 stock converters? Of course there would be no room to have 4 stockers. And if you do this with short headers and they pick up very little, people say it's because of the length of the headers...
In a way, lth are probably not even loud, it's the removal of all 4 converters and only having 2 race converters or none, that is loud.
Too bad nobody makes short headers anymore.

Doc, what HP are the PLM logs good for, with all 4 stock converters?

Doc Oc

I've never dynod with just the plm's. Did the headers and cat pipes at the same time. From my research on this site though it looks like they're good for about 14 rwhp by themselves.