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BMW 3-Series (E90 E92) Forum
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New source for cheap $199 downpipes!
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12-01-2009, 08:20 PM | #156 | |
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Until someone tries these out, all the self-proclaimed PhDs in fluid mechanics who popped up in this thread need to shut up. |
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12-01-2009, 09:04 PM | #157 |
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12-02-2009, 12:37 AM | #158 |
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What looks like a sharp corner on the inside curve at the inlet of the downpipe, pictured above, is not an ideal design. Considering the other designs I have seen, with much smoother transitions at that point, it is easy to speculate that this downpipe is a lesser design. As to what effect it has on HP.... no one knows.
Let the testing begin... Oh... I do not have a PhD in fluid mechanics.
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12-02-2009, 01:31 AM | #159 | |
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12-02-2009, 01:41 AM | #160 |
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THANK YOU. If they work better than stock, is there REALLY anything wrong with them? They cost nearly nothing. If they aren't better than stock, we will continue the search. Can't fault someone for investigating.
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12-02-2009, 02:12 AM | #161 | ||
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this reminds of the story about the hospital in NY that had two entrances, one for insured, and one for uninsureds. right, and thats why i said that. the mfg part done overseas is what lowers the cost. AR does theirs in house by hand instead of a 6 year old that knows how to tig weld.
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12-02-2009, 06:03 AM | #163 |
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I think I would agree if it wasn't for one thing... the install. If you could do the job in 30 minutes then I would agree, but this is a 3 hour job on a lift and longer on the floor. For someone like me, I want to do this job once and only once period.
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12-02-2009, 07:16 AM | #164 | |
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12-02-2009, 09:15 AM | #165 |
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I think the welds look terrible on these pipes, especially in comparison with AR or MS pipes. You guys who are saying the welds look decent - did you look closely? In the pictures I see it looks like they are so thin in a couple of areas that you can just about see the edge of the pipe right through them. Also, why do you think they recommend cleaning them with steel wool every month (and how the hell are you going to do that - take them out once a month, clean then, and reinstall)? It's to take the rust off, of course. These things will be rust buckets in no time and I wouldn't be a bit surprised if those amatuer welds started leaking after a year or two. No way I would ever take the time and effort to install these on my car.
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12-02-2009, 09:46 AM | #166 |
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Thats why we need a guinea pig to try them and inform us.
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12-02-2009, 09:51 AM | #167 | |
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Again we are not comparing these to AR or MS, we already came to the conclusion that they are better pipes try not to beat the dead horse anymore. You cannot come to a conclusion of the welds from a pic on ebay. To know this for sure the only way is to have a set and inspect it directly. We can speculate all day but until someone jumps on them we will never know for sure. JBlackwell said he will have his pair today so we will know soon enough.
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12-02-2009, 10:01 AM | #170 |
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I know i'm trying to resize them or something, I can't tell from the pics I will ask for better ones as these are way to fuzzy. Jblackwell says he will take some with his dslr so I guess we can wait on that.
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12-02-2009, 10:02 AM | #171 |
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Fair enough. Looking forward to someone trying them and posting good close-ups of the welds. I'd also be interested in seeing what they look like after a few months of use in typical driving conditions - including wet weather...
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12-02-2009, 10:10 AM | #172 |
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Yeah, because it takes a PhD to realize that those pipes will not flow as well as MS or AR pipes. Also, telling people to shut up on a public forum over the internet is completely pointless. My point was sure, these pipes may flow better than stock for a relatively small amount of money, but as long as you have these pipes on your car you will have to live knowing that your car could be faster had you bought higher quality pipes. I bought $1000 exhaust manifolds (pair) and $675 downpipes for my 300ZX, and based on factual data I am happy knowing that I have the best performing pre-made exhaust plumbing currently on the market for my car. Maximum performance is my goal, and these pipes will not accomplish that, which is why I stated that I would never put these pipes on my car.
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12-02-2009, 10:15 AM | #173 | |
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12-02-2009, 10:28 AM | #174 |
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I don't know about this - 6 year old??? I have pictures from China at one of the mills we were potentially going to source from. The employees were more like 12. You need to get your facts straight.
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12-02-2009, 10:30 AM | #175 |
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haha your real funny bro. i would love to know your mechanical background or welding experience since you want to be a douche on this thread as if you have built a dp or have any welding experience. please show me something to prove your word is credable and i will apologize and shut my mouth, til then you can kiss my a$$
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12-02-2009, 10:46 AM | #176 | |
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