Performance Mods
Thread Starter
Junior Member
Joined: Apr 2009
Posts: 63
Likes: 1
2009 C350
Performance Mods
Newbie - just picked up my C350 in the last month. For all of you veterans...what would you list as the top five performance modifications you would make to your C300/C350 if price wasn't an issue?
MBWorld Fanatic!
Joined: Feb 2009
Posts: 1,005
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From: Toronto
2009 C300 4Matic
*looks @ screen name*...
...
hmm...
i got it...
up and coming rapper!... think about the "boy pimp" part though... that could cause you some issues b.
oh yea...
the search feature works!
:no help:
...
hmm...
i got it...
up and coming rapper!... think about the "boy pimp" part though... that could cause you some issues b.
oh yea...
the search feature works!
:no help:
Thread Starter
Junior Member
Joined: Apr 2009
Posts: 63
Likes: 1
2009 C350
TB5 (glass houses) the comic...nice to see you take the time to insult me but unable to add anything to the post. I hope this forum is more helpful than this. I understand how to use search, but I wanted to get an idea of what people feel are the best peformance mods.
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Joined: Nov 2007
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From: Phoenix, AZ
2014 Ghibli S Q4 & 2008 C350
Congrats on the C350 and welcome! 
Here's is what I've found.
Renntech has a header & ECU tune that they claim adds about 40hp/tq - costs about $4000 (according to them it doesn't fit real well on the W204 but can be made to work)
Kleemann has a similar setup that also adds ~40hp/tq and they are releasing a version of the header for our W204 chassis. May cost a little less, but don't know for sure until they release the headers in the next couple months. Could be closer to $3000-$3500.
Kleemann is also testing a supercharger, oops sorry, a kompressor for our engine (M272 3.5L) that should bring the output up to around 350hp (includes headers and ECU tune) and it will likely cost between $10-15K, probably won't be available until late 2009.
Brabus can rebuild your engine for about $30K and make it a 4.0 liter and raise the output to around 350hp or so IIRC.
There are numerous other tuners that just do ECU tunes that can add 10-20hp from their claims. Costs vary from about $600 for Powerchip to over $2000 with MKB.
There are also complete exhaust systems out there, but from what I've been able to gather our OE exhaust is already fairly good so there is not a lot to gain from JUST swapping out the exhaust (excluding headers).
Personally, if I decide to do this I'm considering the Kleemann headers and ECU tune for starters and see how that goes. I'm hoping someone comes out with a better airbox for our engine.
Here's is what I've found.
Renntech has a header & ECU tune that they claim adds about 40hp/tq - costs about $4000 (according to them it doesn't fit real well on the W204 but can be made to work)
Kleemann has a similar setup that also adds ~40hp/tq and they are releasing a version of the header for our W204 chassis. May cost a little less, but don't know for sure until they release the headers in the next couple months. Could be closer to $3000-$3500.
Kleemann is also testing a supercharger, oops sorry, a kompressor for our engine (M272 3.5L) that should bring the output up to around 350hp (includes headers and ECU tune) and it will likely cost between $10-15K, probably won't be available until late 2009.
Brabus can rebuild your engine for about $30K and make it a 4.0 liter and raise the output to around 350hp or so IIRC.
There are numerous other tuners that just do ECU tunes that can add 10-20hp from their claims. Costs vary from about $600 for Powerchip to over $2000 with MKB.
There are also complete exhaust systems out there, but from what I've been able to gather our OE exhaust is already fairly good so there is not a lot to gain from JUST swapping out the exhaust (excluding headers).
Personally, if I decide to do this I'm considering the Kleemann headers and ECU tune for starters and see how that goes. I'm hoping someone comes out with a better airbox for our engine.
Thread Starter
Junior Member
Joined: Apr 2009
Posts: 63
Likes: 1
2009 C350
Krytech - thank you for the quick response. Since this is my first MB, how are they on warranty related to ECU tunes?
The headers sound like a great idea and I was hoping for a kompressor option on this car, good to know that it is in the works.
Questioning to myself if I should have stepped up to the AMG......but I love customizing.
The headers sound like a great idea and I was hoping for a kompressor option on this car, good to know that it is in the works.
Questioning to myself if I should have stepped up to the AMG......but I love customizing.
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Joined: Apr 2008
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From: Chino Hills, CA
Mercedes C300 Sport, BMW 745Li, VW Mk6 Golf TDI
Krytech - thank you for the quick response. Since this is my first MB, how are they on warranty related to ECU tunes?
The headers sound like a great idea and I was hoping for a kompressor option on this car, good to know that it is in the works.
Questioning to myself if I should have stepped up to the AMG......but I love customizing.
The headers sound like a great idea and I was hoping for a kompressor option on this car, good to know that it is in the works.
Questioning to myself if I should have stepped up to the AMG......but I love customizing.
Kleeman is a great option to go with both price and performance wise. Rebuilt brabus will be the best, but for that price, you might as well have gotten a 63.
ECU can void certain warranties if it is found to be the root cause of whatever breakdown happened, but they can't just blindly 88 your car if it has a ECU tune. It's the law.
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MBWorld Fanatic!
Joined: Apr 2008
Posts: 3,809
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From: Chino Hills, CA
Mercedes C300 Sport, BMW 745Li, VW Mk6 Golf TDI
it's like little droplets of water in a cup....individually, they won't quench your hp thirst, but when you add them all up, you'll have a full cup.
2008, 2009, c300, c350, compression, engine, list, low, mod, modification, modifications, mods, performance, pistons, w204
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