Straight pipes dyno result
04-01-2011, 02:19 AM
#26
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'11 C63 w/ P31
04-01-2011, 10:51 AM
#27
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^ You can buy an X from either GT-Pro or forum sponsor, MBH that is easily reversible back to stock. For a little less than the price of MBH's X, they also sell a straight pipe version.
04-01-2011, 09:16 PM
#28
MBWorld Fanatic!
Yes AMG, very similar to that. Benz does that quite a bit for manufacturing & packaging purposes. Also, 2.75" is not an industry standard cat size where as 2.25 & 2.5 are. For some reason they chose to squeeze a 2.25" inlet/oulet cat on a 2.75" system (again probably to save space & money).
You can still get amazing power out of the stock system if you just know which key bottlenecks to address.
If I am not mistake I think the inlet to the OEM catback may also be crimped on some models so that could be another key area to address. Best thing to do is just buy a set of digital calipers, lift the car up on a rack, then go through the entire exhaust looking for any bottlenecks. Subtract roughly 0.1" from the OD to get to the ID and you can get an idea of the flow rates you are dealing with. Its really not that hard to figure out once you use a bit of common sense and basic understanding of the forces involved.
I wouldn't be surprised if you could pick up an easy 30-40HP @ crank just by upgrading all the restrictions in the stock system (and that's on stock exhaust manifolds). I have mentioned many of the bottlenecks, but there could be a few more I overlooked.
The biggest restriction ultimately is the 2.0" Primary downtube leading into the stock cat, but even with that ... if you were to open up the rest of the system to a TRUE 2.75" you would make plenty of power without sacrificing any torque.
Just don't go 3.0", that becomes too big of a jump on stock manifolds. Long Tubes .... that's a different story
You can still get amazing power out of the stock system if you just know which key bottlenecks to address.
If I am not mistake I think the inlet to the OEM catback may also be crimped on some models so that could be another key area to address. Best thing to do is just buy a set of digital calipers, lift the car up on a rack, then go through the entire exhaust looking for any bottlenecks. Subtract roughly 0.1" from the OD to get to the ID and you can get an idea of the flow rates you are dealing with. Its really not that hard to figure out once you use a bit of common sense and basic understanding of the forces involved.
I wouldn't be surprised if you could pick up an easy 30-40HP @ crank just by upgrading all the restrictions in the stock system (and that's on stock exhaust manifolds). I have mentioned many of the bottlenecks, but there could be a few more I overlooked.
The biggest restriction ultimately is the 2.0" Primary downtube leading into the stock cat, but even with that ... if you were to open up the rest of the system to a TRUE 2.75" you would make plenty of power without sacrificing any torque.
Just don't go 3.0", that becomes too big of a jump on stock manifolds. Long Tubes .... that's a different story
There is actually a big crimp on the right side piping right after the resonator and right before the muffler. there is also a crimp and the far right exhaust tip piping. I find this pretty odd considering there are no obstructions in the way of these pipes.
I agree with opening up the piping to at least a true 2.7 this would definitely make great power while retaining torque. If im not mistaken i think the entire car graphic setup is a 2.75 system.
04-02-2011, 01:23 AM
#30
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04-02-2011, 02:54 AM
#32
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04-03-2011, 02:08 PM
#34
MBWorld Fanatic!
They are selling it for $1,500. Its a 3" system that removes both primary+2ndary cats and is a direct bolt on kit.
32 HP gain.
Here is a link to the member that has the FMU X pipe.
https://mbworld.org/forums/c63-amg-w...lled-week.html
32 HP gain.
Here is a link to the member that has the FMU X pipe.
https://mbworld.org/forums/c63-amg-w...lled-week.html
Last edited by _AMG_; 04-03-2011 at 02:16 PM.
04-03-2011, 04:08 PM
#36
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