jangy

I drove by yesterday, but i was in the pacifica (which i need to sell). I'm taking the E up to OC for some more abuse, so I will probably start the Exhaust project next week. Marco sent me concepts and I am having them drawn up a bit cleaner to give to them to give me a quote. They definitely have the pipes and tools to make some ver clean bends. I even talked to them about cutouts and they have done quite a few. I don't want them, but marco does!!

speedpeddler

You are an idiot.

Drag racers hold almost every automotive speed and acceleration world record.

aleksandar1099

I am also jumping on this bandwagon.(its what everyone is doing theses days). I went to CPT today and i am taking my car next week to get cutouts put in!! I will take pics and vids when i get back!! Al@ Cpt told me I can get 20rwhp, that is insane just from exhaust.

chiromikey

20rwhp from cutouts? even if they're removing the primary cats and adding other exhaust parts (besides headers) that's a bit far fetched and i'd demand a money back guarantee on that claim!

ChicagoX

I saw a dyno there of an E55 w/ cutouts....I think it was 20whp at the top end, and a 15 wtq loss down low.

The SRT-6 guys show similar results with them open, but gains across the board with them partially open.

Te best setup IMO would be a timer- or vacuum-based delay. Closed at launch, open by the 330' foot mark.


I put mine on strictly for scaring (scarring?) pets and small children. I expect no change save a smile on my face.

chiromikey

i'd have to see it to believe it.

ChicagoX

Next time I'm there, I'll try to get you a copy of the dyno sheet.

chiromikey

appreciated as wouldn't mind seeing the graph, but a single dyno sheet still won't convince me. i see too many inflated and/or unrepeatable dyno numbers around here already.

aleksandar1099

hey I am not buying the cutouts for the power, only for the sound , and I trust al's opinion

rflow306

I have to agree
What ever happened to posting correction factors and run conditions when dyno's are posted ?

jangy

Alright. things may be getting interesting.... dyno....you waited, so yours is the way you want it....

bobgodd

PPl have been running cutouts for years on other vehicles and making more power, why so skeptical?

You think that the E55 exhaust with it's tiny restrictive manifolds is as good as it gets, and that no exhaust mod could possibly improve upon it?? That, I don't buy.

ChicagoX

I'll put the actuators on and dyno them myself, then.

CFs and atmospherics will be posted.

chiromikey

people have also been running cutouts for years and LOSING power and that's what i've seen more often than anything else.

that's not what is being said here. i know there's plenty of room for improvement in our exhaust system and there's pictures posted around here of my car to prove it.

chiromikey

bobgodd

I'm sure there are some times where the cutout hurt the performance of a vehicle, but a well designed exhaust with a cutout should almost always make more top end hp.

chiromikey

you nailed right there and now i know we're on the same page. exhaust should be designed as a "system"...and if cutouts are incorperated into that design instead of bolted on, then i totally agree they will (or at least should) yield more power. unfortunatley most of the time they're just slapped in where ever seems convenient.

bobgodd

Most definitely! I guess I just assumed that everyone was on that page haha

dyno

yes, must say that basic difference when speaking about modding the exhaust is that here in US you begin with Headers modding, while in Europe we usually begin with Mufflers modding... also because it's easier: no outlet ports matching issues, room availability for bigger pipes, etc.

it has been very interesting for me to follow all your developments concerning headers .. btw, I think that Supersprint made those long headers especially for you, only !

but now it's really time for mufflers.

As quite few people want a permanently loud exhaust in a Mercedes, I think that cutouts/flap-valves can be the ultimate solution for this task, too.
simply look at latest Ferrari and the performance setup for Porsche: it is obtained by mean of a flap-valve.
No need to say thAt if you install it right after the header .. it is because you have some open issues with neighboroughs ..
but if we find the way to correctly locate them close to rear mufflers .. this is the way to overcome their recognized performance bottleneck function... maybe without need to mod or replace oem mufflers: need only to find out what is the correct by-pass piping size and design

... what about starting with a Yoshimura-like silencer

Mufflers fabricators will not love cutouts .. me think !