03-03-2019, 10:18 AM | #1 |
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AFE Catted DP - N20
Anybody installed an AFE Catted DP on a N20? There's a lot of info out there on the other DPs but I couldn't find much on the AFE version.
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03-04-2019, 07:53 AM | #2 |
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I installed an early cattless AFE DP. The fitment was off at the DP to catback joint. So I cut the 2.25" joint off both sides and installed a 3" V-band and flex pipe in their place. Now perfect fit and should flow better too.
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03-05-2019, 07:40 PM | #3 |
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Skip AFE and get Wagner , VRSF, AR or Evolution Racewerks
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03-05-2019, 09:32 PM | #4 |
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Why skip AFE? And from pictures AR looks like a bad choice, not sure why they would chose to taper it down like that...
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03-05-2019, 09:33 PM | #5 | |
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AR Design downpipes are showing same gains as any of the proven brands
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03-05-2019, 09:37 PM | #6 | |
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I'd figure the gains would be the same, but I still would prefer something that doesn't taper like that, even that preference is unsubstantiated.
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03-05-2019, 09:38 PM | #7 |
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When you compare the numbers we sold of each brand, the rate of all the other brands are within the acceptable margin
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03-06-2019, 08:12 AM | #8 | |
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All down pipes taper down to 2.25" inner diameter. It doesn't matter if its a $99 ching chong ebay special or a $1000 AR/ER/Wagner etc. It doesn't matter if the company that sold it to you advertised it as a 4" downpipe. They all neck down to a 2.25" in dia exit, in order to slip into the factory catback exhaust. The same goes for all cat back exhausts and front pipes. They will all neck down to about a 2.45" inner diameter at the entrance, in order to slip over the factory down pipe.... For some reason none of you people (BMW owners, Vendors or Tuners) seem to care lol. I have had countless people tell me that a couple inch long section of 2.25" piping isn't a big deal and it won't effect performance, but I am an engineer and studied Fluid dynamics way too much for that not to bother me... So I installed an AFE catless down pipe and a Supersprint 3" front pipe, cut the 2.25" section out and welded in a 3" flex pipe and 3" V-band. Now it flows and fits better than any of the most expensive name brands could ever dream of. [puts on flame suit. drops mic. end rant. im out] Last edited by CandyRedRC46; 03-06-2019 at 08:18 AM.. |
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03-06-2019, 09:08 AM | #9 | |
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03-06-2019, 09:36 AM | #10 | |
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03-06-2019, 09:40 AM | #11 | |
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03-06-2019, 09:49 AM | #12 |
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I really wish I had the time/money/energy to do back to back dyno runs for no other purpose than to settle friendly debates on the internet, but my opinion is there is no way that a true full 3" exhaust on a car making +250whp will not out perform the same exhaust on the same car with a 2.25" section placed in somewhere.
Now whether this is the difference of 5 or 25 whp, I don't know, but on a car that we are all shooting for 300whp in, 2.25" is not adequate. |
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03-06-2019, 11:04 AM | #15 |
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Not gonna lie, those pictures are pretty convincing lol. Definitely a bottleneck physically. But I would imagine that the fact it's a relatively low output, small engine not generating that much exhaust gas volume would minimize any gains from eliminating that bottleneck. If we were talking about a 6.0L 500hp V8 with that bottleneck, yah, that's definitely robbing power. Regardless, impossible to know if it makes a difference without dyno data like you said. I would be very interested to find out.
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03-06-2019, 11:08 AM | #16 |
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Also, that pic of the AR DP makes it look way better than the picture I saw. It's a very smooth taper, not as abrupt as I thought.
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03-22-2019, 08:32 AM | #17 | |
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Manufacturers please listen to us and make a solution.
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03-22-2019, 08:46 AM | #18 |
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Speaking of fitment... best stay away from VRSF.
AFE is a proven brand (unlike VRSF)... you should not have any issues with their pipe. |
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03-25-2019, 08:14 AM | #19 | |
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I tried several times to fit it. Once even by a friend at my BMW dealership that is a BMW tech. It simply would not seal tightly at the downpipe to catback connection, so cutting out that connection and welding in a VBand and flex pipe in it's place was a must, just a nice bonus that I went 3" instead of 2.25" like the original connection. I also had to slightly realign the bracket that bolts to the engine block (no big deal). In my opinion if you buy a down pipe that does not include a flex pipe section, it is going to be very hard to get a perfect, leak free fit. It is also going to add unnecessary stress to the turbo manifold, turbo, down pipe, exhaust system and all fasteners/hardware in between. Why AFE skipped out on this is beyond me, they ought to know better. |
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