R56 Cat-back compared to stock exhaust
#26
Join Date: Jan 2014
Location: From Michigan, United States, Currently living in Germany
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The second cat is just an unmonitored emissions reducing device and as a rule very restrictive. The resonator on the other hand serves a couple of purposes and is not very restrictive.
Simple explanation : A resonator, well, it resonates. It reflects sound waves back. Within a given frequency range, this creates destructive interference, canceling out sound.
So, if you want to get rid of the "fart cannon" sound, you'll need to add a resonator that will cancel out the frequency that your exhaust is generating that you dislike, place it at the correct location in the exhaust path (it matters a lot where it is) to allow it to do so, and go from there.
Most small diameter systems require a resonator to keep them from just being annoying. Most systems are designed with this in mind, the CNT being one.
Not so much a requirement in large displacement engines using large diameter systems. My Vette and Suburban have no resonators, but both have 3" maganflow dual exhaust systems. No annoying frequencies inherent in a V8.
Just my opinion and YMMV.
CNT Racing is listing the system for $389 on their web site. I have seen it cheaper when they have a deal listed, like their resonated DP is on sale now for $199 instead of the regular $249.
Not sure what the restrictions are these days on packages going to APO or FPO, but it's not a real big box.
Simple explanation : A resonator, well, it resonates. It reflects sound waves back. Within a given frequency range, this creates destructive interference, canceling out sound.
So, if you want to get rid of the "fart cannon" sound, you'll need to add a resonator that will cancel out the frequency that your exhaust is generating that you dislike, place it at the correct location in the exhaust path (it matters a lot where it is) to allow it to do so, and go from there.
Most small diameter systems require a resonator to keep them from just being annoying. Most systems are designed with this in mind, the CNT being one.
Not so much a requirement in large displacement engines using large diameter systems. My Vette and Suburban have no resonators, but both have 3" maganflow dual exhaust systems. No annoying frequencies inherent in a V8.
Just my opinion and YMMV.
CNT Racing is listing the system for $389 on their web site. I have seen it cheaper when they have a deal listed, like their resonated DP is on sale now for $199 instead of the regular $249.
Not sure what the restrictions are these days on packages going to APO or FPO, but it's not a real big box.
#27
If it were me, I would install all the goodies (including exhaust system) before getting the tune. That way they can tune it for all your mods at one time. That's my plan anyway. I'm getting walnut blasted monday, and tuesday I'm installing my Forge vacuum activated BOV, AEM CAI, and BSH OCC. After Minis on the Dragon I'm thinking of going with the CNT resonated DP with JetHot coating and the WMW Turbo Wrap. The JetHot coating is supposed to cut external temps in half and retain the heat internally to enhance scavenging. Then I'm going to get it tuned. I'm thinking Helix at this time. I wish I could afford the Akropovic.
#28
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Location: From Michigan, United States, Currently living in Germany
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If it were me, I would install all the goodies (including exhaust system) before getting the tune. That way they can tune it for all your mods at one time. That's my plan anyway. I'm getting walnut blasted monday, and tuesday I'm installing my Forge vacuum activated BOV, AEM CAI, and BSH OCC. After Minis on the Dragon I'm thinking of going with the CNT resonated DP with JetHot coating and the WMW Turbo Wrap. The JetHot coating is supposed to cut external temps in half and retain the heat internally to enhance scavenging. Then I'm going to get it tuned. I'm thinking Helix at this time. I wish I could afford the Akropovic.
#30
Like raptor said, you would need a tune to eliminate the CEL mainly. I am still fairly new to the Mini's myself, but I do know you will definitely get a CEL with the catless DP.
On my Vette, when I installed headers and removed the cats I installed O2 simulators to eliminate the CEL. While waiting for the sims to come in I just covered the CEL with a piece of electrical tape. Sadly the Mini doesn't come with enough instrumentation to chance doing that.
I am guessing the Delete R does essentially the same thing as the simulators. For what it's worth, I'd say go ahead and install your DP and get the tune. You'll get more power and take care of the pesky CEL, and have a better sounding car.
I'm heading out the door now to get my valves cleaned, so y'all have a good day.
On my Vette, when I installed headers and removed the cats I installed O2 simulators to eliminate the CEL. While waiting for the sims to come in I just covered the CEL with a piece of electrical tape. Sadly the Mini doesn't come with enough instrumentation to chance doing that.
I am guessing the Delete R does essentially the same thing as the simulators. For what it's worth, I'd say go ahead and install your DP and get the tune. You'll get more power and take care of the pesky CEL, and have a better sounding car.
I'm heading out the door now to get my valves cleaned, so y'all have a good day.
#31
Wow, just jumped back in this thread to see what's going on. Vetsvette, before Desert Storm I was a tank company CO in Bamberg Ger with 1AD... the we went south! To answer questions/issues: The Delete-R is an Akrapovic product not a WMW one. It plugs into the computer and tell it to ignore the CEL for the high flow/cat-deleted DP. On my N18 engine, I will get a CEL once every two weeks or so and within 3-5 miles it will go away. I have been told that it is because of the differences in the N18 and that he N14 won't show a CEL at all.... I have been told this. I have never heard of anyone having long term success trying to fool the O-2 sensor with extenders, etc. NM Engineering will NOT tune to eliminate the CEL because they are based in Cali and law forbids it. Put the goodies on! Let the person doing the tune know exactly what you have and they will design the tune for the pieces and parts. A tune can/will do more than deleter the DP CEL. It will help the engine make better use of the increased exhaust flow. Before I got a tune, I opened up both sides (air in/air out) to the maximum extend possible (see mods below). After the tune I found that I seriously NEEDED a limited slip differential to control the additional HP/torque! Pricey but worth it. My next mods are inbound comprising more Powerflex bushing (rear trailing arms), Boost/Oil Press/H20 Temp Prosport gauges and Alta gauge pods). A M7 Tegris Splitter (for standard bumper) will probably be next. Good luck guys!
#32
#33
Join Date: Jan 2014
Location: From Michigan, United States, Currently living in Germany
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Like raptor said, you would need a tune to eliminate the CEL mainly. I am still fairly new to the Mini's myself, but I do know you will definitely get a CEL with the catless DP.
On my Vette, when I installed headers and removed the cats I installed O2 simulators to eliminate the CEL. While waiting for the sims to come in I just covered the CEL with a piece of electrical tape. Sadly the Mini doesn't come with enough instrumentation to chance doing that.
I am guessing the Delete R does essentially the same thing as the simulators. For what it's worth, I'd say go ahead and install your DP and get the tune. You'll get more power and take care of the pesky CEL, and have a better sounding car.
I'm heading out the door now to get my valves cleaned, so y'all have a good day.
On my Vette, when I installed headers and removed the cats I installed O2 simulators to eliminate the CEL. While waiting for the sims to come in I just covered the CEL with a piece of electrical tape. Sadly the Mini doesn't come with enough instrumentation to chance doing that.
I am guessing the Delete R does essentially the same thing as the simulators. For what it's worth, I'd say go ahead and install your DP and get the tune. You'll get more power and take care of the pesky CEL, and have a better sounding car.
I'm heading out the door now to get my valves cleaned, so y'all have a good day.
#35
Join Date: Jan 2014
Location: From Michigan, United States, Currently living in Germany
Posts: 45
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Wow, just jumped back in this thread to see what's going on. Vetsvette, before Desert Storm I was a tank company CO in Bamberg Ger with 1AD... the we went south! To answer questions/issues: The Delete-R is an Akrapovic product not a WMW one. It plugs into the computer and tell it to ignore the CEL for the high flow/cat-deleted DP. On my N18 engine, I will get a CEL once every two weeks or so and within 3-5 miles it will go away. I have been told that it is because of the differences in the N18 and that he N14 won't show a CEL at all.... I have been told this. I have never heard of anyone having long term success trying to fool the O-2 sensor with extenders, etc. NM Engineering will NOT tune to eliminate the CEL because they are based in Cali and law forbids it. Put the goodies on! Let the person doing the tune know exactly what you have and they will design the tune for the pieces and parts. A tune can/will do more than deleter the DP CEL. It will help the engine make better use of the increased exhaust flow. Before I got a tune, I opened up both sides (air in/air out) to the maximum extend possible (see mods below). After the tune I found that I seriously NEEDED a limited slip differential to control the additional HP/torque! Pricey but worth it. My next mods are inbound comprising more Powerflex bushing (rear trailing arms), Boost/Oil Press/H20 Temp Prosport gauges and Alta gauge pods). A M7 Tegris Splitter (for standard bumper) will probably be next. Good luck guys!
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