How much HP does an x pipe with res/secondary cat pipe delete give?
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E55, 380SL, GLA 250 Sport, AMG GTS
You really need to have an X-Pipe in place to produce some back pressure. Just taking the resonator off doesn't do much. Any muffler shop should be able to do it. You don't need a kit.
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From: ChiTown
06 Carrera4
Why is it that everyone is throwing 'loosing back pressure' left and right? Does anyone actually know what, if anything, it will do when you reduce back pressure?
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AMG
That's not entirely true ... X-pipe does not produce back pressure (in fact it does quite the opposite).
The X-pipe improves scavenging effects thereby helping the cylinders empty faster between pulses (especially at the part throttle at low rpms & WOT at high rpms, It doesn't do that much in the mid range). In overly simplistic terms, think of the X-pipe as a vacuum cleaner that sucks any leftover gasses out.
It is not mandatory or necessary ... but it most certainly helps, especially in applications where there is not crossover on the stock system (such as the W210 E55 AMG).
Hope that helps.
The X-pipe improves scavenging effects thereby helping the cylinders empty faster between pulses (especially at the part throttle at low rpms & WOT at high rpms, It doesn't do that much in the mid range). In overly simplistic terms, think of the X-pipe as a vacuum cleaner that sucks any leftover gasses out.
It is not mandatory or necessary ... but it most certainly helps, especially in applications where there is not crossover on the stock system (such as the W210 E55 AMG).
Hope that helps.
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From: Los Angeles
W210 E55
If an X pipe is installed in the right place and the exhaust is setup correctly, it will improve scavenging. Each exhaust pulse heads out of the head and into the exhaust. Each is a pressure wave and has mass and inertia. As it moves past any given point it creates negative pressure behind it. The best is to have these pulses evenly spaced when they join up. To do this all exhaust tubes from each starting point must either be the same length or tuned with differing diameters to ensure the pulses are properly spaced when they merge. An x-pipe ties all eight cylinders together at the X. Location is critical, too long or short on one side and the pulses could collide creating more backpressure. Properly done, an x-pipe, or any merge type pipe for that matter, provides the best exhaust function as well as a sweet, synchronous sound out the back if the rest of the exhaust is symmetrical as well.
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From: Toronto
2011 e350 Wagon & 2004 e320
With all that said, can somebody post some pics to share so for us who are going to attempt this so we can get this installed right and properly the first time. Thanks in advance.
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From: MICHIGAN
2001 E55 - 2008 CLS63 -2016 F-150
+1 and pics of a w210 with the x-pipe in the perfect location . Since i wanna do this next !!!
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AMG
General rule of thumb, the closer the x-pipe is to the headers the better. If you put the x-pipe in front of the secondaries you will get even more gains (its just a bit harder to package it that way.)
For maximum gains and emissions reductions do high flow primaries, x-pipe as soon as the two pipes come close to each other, the secondaries after the X. You can remove resonator of course as well
For maximum gains and emissions reductions do high flow primaries, x-pipe as soon as the two pipes come close to each other, the secondaries after the X. You can remove resonator of course as well
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You are the best 
hahahaha i post pics after complete my new x-pipe set up
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02 E55; 99 CLK430 (Sold)
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AMG
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W210 E55
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e55
also, how challenging are the shorty Header installs? Is it worth it in comjuction with a full exhaust above (true x, secondary car delete and res delete), but leaving primaries? Trying to reduce labor and. How have to drop the motor.
