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BMW 3-Series (E90 E92) Forum
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Introducing VK Motorwerks Catless Downpipes
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01-18-2009, 03:21 AM | #25 |
Gixxer Man
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Wow, you guys are coming out with some good stuff for reasonable prices
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01-18-2009, 08:52 AM | #26 |
Second Lieutenant
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Vince, this is awesome ,looks top notch...looking forward for this.
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01-19-2009, 12:23 AM | #27 | |
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Are you grinding welds to attain polished finish? Argon backpurged? Lastly, where are they being made?
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01-19-2009, 12:38 AM | #28 | |
Custom Powder Coater
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2.5" all around obviously makes no sense if the turbo opening is 3" But I'd also be worried about losing torque with 3" end to end downpipes.
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01-19-2009, 09:04 AM | #33 | |
Major
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The goal of a turbo engine is to reduce back pressure as much as possible so the more free flowing the system is the more torque you will produce. Normally aspirated engines require backpressure to create scavenging to make more torque. |
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01-19-2009, 10:06 AM | #35 |
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Just curious ! are you guys interested in buying these for your cars?
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01-19-2009, 10:14 AM | #36 | |
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Also not sure why people buy the "grinding welds is bad" BS...i have seen products with more critical applications having super polished grinded welds. If the weld penetration is good (which is basically a good weld) then the process of grinding should not be a problem as long they use the right methods and take time and care to do it. Its done routinely in many industries.
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01-19-2009, 10:16 AM | #37 |
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The reason we say these are 2.5" and not 3" is because they open up at 3" and then taper down to a 2.5". I dont want to market these as 3" if it is going to taper down to 2.5", although I know that marketing these as 3" dp's will sound better but we try to stay away from the hype.
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01-19-2009, 12:27 PM | #38 | |
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01-19-2009, 01:16 PM | #40 | |
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The problem with posting hp/tq numbers and then comparing them to other venders is that every vendor uses their own testing procedures. Its very easy to manipulate numbers on a dyno. |
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01-19-2009, 02:49 PM | #41 |
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01-19-2009, 03:14 PM | #43 |
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+1
Looks great inside. This is what i have been waiting for. Thanks for posting.
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