C32 AMG, C55 AMG (W203) 2001 - 2007

Cutting Firewall on C32 to get more POWER

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Old Aug 3, 2011 | 08:45 AM
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C32 AMG
Cutting Firewall on C32 to get more POWER

Has anyone thought about cutting a small part off the firewall so the needswings dual cold air intake would fit, since they have a bigger y-pipe and gives the most power increase. also with that upper center part of the firewall cut out, we can also use the needswings performance intake manifolds (the bigger ones, not modified stock ones).
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Old Aug 3, 2011 | 07:55 PM
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What happens when the engine lights on fire, or in general wouldn't additional unwanted heat transfer into the cabin or places it shouldn't be?
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Old Aug 3, 2011 | 08:06 PM
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This is not a good idea.. Pushing it back maybe but to delete Eh I would not do...
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Old Aug 4, 2011 | 05:15 AM
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Im not suggesting to cut the whole firewall, lol. Just a small square, just enough to clear it. I will do this and see how it goes once i have enough money to buy those manifolds
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Old Aug 4, 2011 | 05:17 AM
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Hmmm...... if you are really cutting the firewall between the engine and psgr compartment then I'd say no way. Even race cars don't do this with out adding back somesort of replacement panel.

Noise, heat, fire hazard all come to mind. With a custom reshapped access panel... then maybe.... but then forget resale, and I imagine there are some liability concerns if people get burned up in your car.

GL.
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Old Aug 4, 2011 | 07:20 AM
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Also...aside from the above mentioned reasons, typically your firewall is designed to be an integral part of the structure of the car. Modifying it in any way can cause major structural weakness in you car. Something else to consider.
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Old Aug 4, 2011 | 09:02 AM
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I could of sworn reading on this forum that someone dif it before. I just don't remember the reason.
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Old Aug 4, 2011 | 01:46 PM
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i don't think cutting the firewall to accomodate a few mm for the intake would make any significant hp gains. why not modify the Y pipe of the cai kit instead? just my $0.02
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Old Aug 4, 2011 | 01:54 PM
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Originally Posted by Jordan7589
Im not suggesting to cut the whole firewall, lol. Just a small square, just enough to clear it. I will do this and see how it goes once i have enough money to buy those manifolds
if you do that you would definetly be the owner of the car thats some serious crap rightthere, there is a reason why its called firewall im just saying. i would do a search as this is becoming an old car and everything that you can think about doing has already been thought about and tried by someone.
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Old Aug 4, 2011 | 07:41 PM
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Originally Posted by W203Ramos
i don't think cutting the firewall to accomodate a few mm for the intake would make any significant hp gains. why not modify the Y pipe of the cai kit instead? just my $0.02
the needswing dual cai is a monster intake 20 rwhp on my 32. the issue with the needswings manis would be the hood not the firewall
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Old Aug 4, 2011 | 08:34 PM
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Originally Posted by W203Ramos
i don't think cutting the firewall to accomodate a few mm for the intake would make any significant hp gains. why not modify the Y pipe of the cai kit instead? just my $0.02
This is a much better idea. Yes, you could modify the firewall but it's not as easy as you're making it sound. Modifying the Y pipe is a much better idea but it will of course affect the airflow within the pipe.
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Old Aug 4, 2011 | 08:57 PM
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if everyone is talking about modifying the needswing y pipe wont happen. its a custom made silicone style y that is woven together. impossible to get another if you screw it up!
i can post a pic if you guys want one
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Old Aug 5, 2011 | 03:00 PM
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Originally Posted by 320 dreamer
the needswing dual cai is a monster intake 20 rwhp on my 32. the issue with the needswings manis would be the hood not the firewall
let me rephrase....what i meant was....will modifying the Y-pipe cause you to loose that much hp? instead of the full 20 rwhp gain because of the "air flow" issue
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Old Aug 5, 2011 | 03:03 PM
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oooops....didn't get to read the last post, I didn't know that the Y-pipe was silicone and can you please post a pic 320 drmr. how much space do we actually need to accomodate the cai kit?
TIA,
John
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Old Aug 5, 2011 | 05:42 PM
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Originally Posted by W203Ramos
oooops....didn't get to read the last post, I didn't know that the Y-pipe was silicone and can you please post a pic 320 drmr. how much space do we actually need to accomodate the cai kit?
TIA,
John
ill get a pic this weekend as im removing the dual cai to install a prototype fuel rail from ttmotorsports ala e55 rail!! hoping this helps the big pulley guys with the lean conditions.
understand the y pipe on robs setup is just 1 peice of the puzzle. the 3" tubes are teflon coated on the inside to inc flow and the dual setup flows 770 cfm
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Old Aug 5, 2011 | 07:00 PM
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Originally Posted by 320 dreamer
the needswing dual cai is a monster intake 20 rwhp on my 32. the issue with the needswings manis would be the hood not the firewall



+1, finally a voice of reason!!!
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Old Aug 6, 2011 | 12:37 PM
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heres the pic of the y splitter the n/w manis sit much higher than oem and thats why they flow 970 cfm. more room for more air
Attached Thumbnails Cutting Firewall on C32 to get more POWER-hpim0658.jpg  
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Old Aug 6, 2011 | 01:11 PM
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Originally Posted by 320 dreamer
ill get a pic this weekend as im removing the dual cai to install a prototype fuel rail from ttmotorsports ala e55 rail!! hoping this helps the big pulley guys with the lean conditions.
understand the y pipe on robs setup is just 1 peice of the puzzle. the 3" tubes are teflon coated on the inside to inc flow and the dual setup flows 770 cfm
Do you have a thread on the mods that you are doing or are planning on doing? I'd like to read some of your ideas.
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Old Aug 6, 2011 | 06:36 PM
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Originally Posted by loudandheard
Do you have a thread on the mods that you are doing or are planning on doing? I'd like to read some of your ideas.
i guess most of my mods are posted either here or on the xfire forum. i really dont have ideas per say just following the e55 guys and adapting some of what they have for the v6. the xfire folks race a ton so e/c and needswings build parts to support the car. it all fits mine so im fortunate there. i could give you a list of what i currently have if you want and as for future mods im working on getting a set of headers for the slk32, true dual exhaust and a c/f front lip and diffuser to allow the install of a set of slk55 dual amg mufflers. my big brake upgrade ( full slk55 with r/b 2 piece rotors from a c32) will be done next week , the fuel rail is still in design and testing, um c/f hood and roof and trunk? for now my goal is a timeslip in the 11,s rwhp and torque in excess of 400. im at 357 rwhp and 372 ft/lbs so im not far off. the n/w manis along with some new exciting injectors and ttmotorsports fuel rail retune with jerry should push me over the top.
i have an addiction so someone please help me!!!
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Old Aug 7, 2011 | 09:23 PM
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Originally Posted by loudandheard
I could of sworn reading on this forum that someone dif it before. I just don't remember the reason.
I asked a couple month ago if someone ever look whats behind the fire wall, I have modify firewall before and I tought it was a good option for my C32 too, I will explore whit winter when I take it apart
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Old Mar 10, 2012 | 12:13 AM
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Can the side walls in the engine bay be removable? The ones separating the battery and the engine.
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