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      05-08-2017, 08:52 PM   #1
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AR Downpipe Vs. ER 4" Catless

Tough choice. AR is a more reputable company and design is flawless. On the other hand the E.R. comes in 4"
decisons decisons
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      05-12-2017, 12:24 PM   #2
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which one did you end up getting, would like to know.
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      05-13-2017, 10:56 AM   #3
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Going to go with the E.R. being that the bend is "4 inch. The AR design is way superior. Will let you know how it is once installed
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      07-12-2017, 04:30 AM   #4
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Any updates on this. Contemplating on getting
Downpipes as well
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      07-12-2017, 10:54 AM   #5
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following.....
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      07-12-2017, 05:43 PM   #6
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Went with the ar downpipe. If your looking for sound then its def. Not what your going to get. You will loose low end torque unless you get a tune or a sprint booster pedal box. Uptop the car will pull like a frieght train. Also your car will smell like rotten egg of you go catless from time to time.
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      07-12-2017, 05:44 PM   #7
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Also havr jb4 tuner so im throwing no codes
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      07-14-2017, 03:56 PM   #8
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pros and cons on going catless vs catted?
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      07-15-2017, 06:54 AM   #9
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From my understanding, castles downpipes will have less air restriction, therefore obtaining more hp from the downpipes.

Negatives is the smell and potentially being too loud.

I have been contemplating downpipes for a few weeks. Leaning towards AR. Any one know any deals or group buys
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      07-17-2017, 08:15 PM   #10
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Quote:
Originally Posted by felixleasing
From my understanding, castles downpipes will have less air restriction, therefore obtaining more hp from the downpipes.

Negatives is the smell and potentially being too loud.

I have been contemplating downpipes for a few weeks. Leaning towards AR. Any one know any deals or group buys
what about check engine lights any way of avoiding them with catless?
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      07-17-2017, 08:19 PM   #11
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what about check engine lights any way of avoiding them with catless?
They can be coded out.
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      07-17-2017, 08:38 PM   #12
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Quote:
Originally Posted by upstate650
Quote:
Originally Posted by doughboy650gc View Post
what about check engine lights any way of avoiding them with catless?
They can be coded out.
ok,who can code em out? sorry for the dumb questions... thank you for your feedback btw!
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      07-17-2017, 10:57 PM   #13
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Ask in M5 or M6 forum. Don't have a name for you.
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      07-20-2017, 05:45 AM   #14
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Anyone tried active autoworks down pipes? The are about 30 percent cheaper.
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      07-24-2017, 10:57 AM   #15
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Quote:
Originally Posted by doughboy650gc View Post
what about check engine lights any way of avoiding them with catless?
Jb4 will erase the check engine light
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      02-09-2018, 07:00 AM   #16
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General question - does anyone know if gaskets on the turbo side need to be replaced when installing catless downpipes? If so, is there a part number?
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      02-09-2018, 07:47 AM   #17
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I do not see a part number/gasket on the turbo to downpipe side...

http://www.realoem.com/bmw/enUS/show...diagId=11_5125
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      02-11-2018, 06:39 PM   #18
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might have to call your local dealership for that bro
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      02-12-2018, 10:26 AM   #19
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Checked with the company and they said it doesn't need replacement if they are in good shape. They gave me part # 18307553601.

Finally got the downpipe installed and I have to say the turbo sound is SO much more pronounced now that you can hear it through the exhaust. Is this typical? The exhaust is now 2x louder than before but it is not overbearing especially at cruising speeds.

Last edited by AmooManiak; 02-12-2018 at 10:40 AM..
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      02-12-2018, 11:19 AM   #20
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Quote:
Originally Posted by AmooManiak View Post
Checked with the company and they said it doesn't need replacement if they are in good shape. They gave me part # 18307553601.

Finally got the downpipe installed and I have to say the turbo sound is SO much more pronounced now that you can hear it through the exhaust. Is this typical? The exhaust is now 2x louder than before but it is not overbearing especially at cruising speeds.
Nice! - which ones did you end up going with? hi flow cats or no?
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      02-12-2018, 12:40 PM   #21
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Quote:
Originally Posted by upstate650 View Post
Nice! - which ones did you end up going with? hi flow cats or no?
Catless from ARM Motorsports.
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      02-12-2018, 02:13 PM   #22
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Catless from ARM Motorsports.
how's the smell?

I've got my eye on the AR design downpipes with ceramic coating. They are dreamy
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Last edited by upstate650; 02-12-2018 at 02:45 PM..
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