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02-18-2015, 04:04 AM | #1 |
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downpipe question
can someone educate me on downpipes and their functions. why there are 3.5" and 4", why some come with resonators and will there be a more aggressive engine note? Any info and favorite dp's are appreciated.
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02-18-2015, 11:10 AM | #3 |
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Exhaust downpipes live directly on the back of your turbo or turbos. Usually factory downpipe(s) are optimized for stock boost levels and most importantly emissions. Aftermarket units primary purpose is to remove exhaust gases as quickly as possible therefore they usually are larger diameter, less bends, and usually remove some or all emissions equipment. This allows you to raise boost levels more safely over stock without the risk of damage to the turbo.
To answer your 3.5 vs 4" question you will mostly see an improvement in higher horsepower applications that most likely involve larger turbos. Don't stress out too much about half an inch either.. especially and a stage 2 car you'll never really see a difference. If larger turbos and other supporting mods are in the future then it's probably worth going with the larger of the two. Just keep in mind your state inspections when it comes to choosing catless vs catted since removing your emissions equipment will cause the car not to pass inspections usually. Also most stage 2 cars with aftermarket cats run very close performance-wise to a non catted vehicle. With a catless setup you will definitely hear more turbo noise/spool out the exhaust and typically get a more of a raw smell fuel too. I'll admit though the N55 and the N63 factory downpipes look pretty efficient from factory and I think in order to see significant gains over stock, catless would make more sense. Also last but not least be sure to pair downpipe changes with some sort of engine management as you will need tuning to compensate. Check out Burger Tuning as they support most platforms. I'm no expert on the subject but hopefully that gives you a decent idea of their purpose. |
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02-18-2015, 11:21 AM | #4 | ||
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Favorite DP for your car is the Evolution Racewerks catless
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02-18-2015, 07:42 PM | #5 | |
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02-18-2015, 09:11 PM | #6 | |
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02-19-2015, 09:52 AM | #7 |
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Yes but they are discontinued some down pipe manufacturers make bungs that allow for the readings not to trigger the code. But honestly it comes on every 50 miles. What you can do is get the Bluetooth odb2 reader and reset it using your phone every 50 miles.
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03-07-2015, 11:32 AM | #9 |
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03-07-2015, 11:36 AM | #10 |
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OP: I have ER competition catless DP on my car and although it costs more than the others, I'm very happy with my purchase. Im not sure of the difference between 3.5in and 4in but you know what they say, every inch (or half) counts lol. Check my build thread if need be . What really sold me on the ER DP was the robust design and flex section.
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03-07-2015, 03:55 PM | #11 |
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My M has this System install : http://www.insideperformance.de/5er-...ownpipes_1293/
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03-07-2015, 07:32 PM | #12 | |
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03-11-2015, 02:01 AM | #13 |
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03-11-2015, 07:30 PM | #14 | |
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I have OBDLINK Lx (Bluetooth) friend has MX (Wifi) The bluetooth works on Android, Wifi on iPhone Obdlink also has a free app but we also use dash command and torque pro able to read, clear codes, auto-clear , see temps, etc
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03-12-2015, 08:40 AM | #15 |
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+1 for what ROBNYC said and what badblack550xi said about the Bluetooth OBD II scanner. One of the BEST investments I have made just to get a more complete picture of what your car is really doing. Oh, and clearing fault lights is an added benefit.
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03-12-2015, 09:52 AM | #16 |
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yet BMW charges $180 to read codes...
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03-28-2015, 12:32 PM | #18 | |
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Yes as the BMS doesn't have the ability to turn off codes. Here's what I plan on getting based on other members luck with them. I've used anti-foulers before on other cars so I'm hoping they work out ok! http://www.ebay.com/itm/290756683675...%3AMEBIDX%3AIT |
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03-29-2015, 04:57 AM | #19 | |
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JB4 DOES clear codes, it just comes back once in a while. +1 on doing it remotely via DashCommander/bluetooth. |
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03-29-2015, 11:46 AM | #21 | |
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Someone mentioned a spacer also
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03-29-2015, 01:27 PM | #22 |
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they don't always work
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