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      02-24-2020, 09:13 PM   #1
X5MBronx
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Downpipe For X5M 2015

What Downpipe do you guys suggest for x5M 2015

I'm thinking of deleting resonator and adding downpipe
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      02-24-2020, 09:30 PM   #2
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I have the vrsf on my f85 2015 and love the sound.

Price was very good compared to others.

Setup atm: downpipes, custom tune, afe intake, vtf springs to the lowest.
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      02-24-2020, 09:48 PM   #3
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Originally Posted by theone_06 View Post
I have the vrsf on my f85 2015 and love the sound.

Price was very good compared to others.

Setup atm: downpipes, custom tune, afe intake, vtf springs to the lowest.
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I have the vrsf on my f85 2015 and love the sound.

Price was very good compared to others.

Setup atm: downpipes, custom tune, afe intake, vtf springs to the lowest.
Would you mind sending me a link brother
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      02-24-2020, 09:50 PM   #4
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https://www.vr-speed.com/vrsf-stainl...6-x5m-x6m.html
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      02-24-2020, 09:55 PM   #5
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Does your check engine lite come on ??
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      02-25-2020, 02:09 AM   #6
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I am with ER catted 200cel dp. No smell in garage
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      02-25-2020, 07:03 AM   #7
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I am with ER catted 200cel dp. No smell in garage
Does anyone have any other ideas
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      02-25-2020, 08:01 AM   #8
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I am with ER catted 200cel dp. No smell in garage
I've been debating getting downpipes as well but was concerned about the smell. Is it worth it to get catted pipes though? What's the average power difference between catted and catless?
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      02-25-2020, 09:51 AM   #9
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I'm using active autowerks on my F86 with a DME tune. Sound is amazing and burbles on downshifts but not obnoxious like the burbles you get from a tune.
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      02-25-2020, 12:19 PM   #10
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Originally Posted by superkevin813 View Post
I am with ER catted 200cel dp. No smell in garage
I've been debating getting downpipes as well but was concerned about the smell. Is it worth it to get catted pipes though? What's the average power difference between catted and catless?
catted DP
Pro:
less smell
Get most of performance gain
filter out raspiness and noise
Depend on #cell, you can get rid of CEL without a tune
Protect the Earth?

Con:
Not get maximum performance
Expensive
Expensive
Expensive
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      02-25-2020, 01:17 PM   #11
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Honestly, unless you are going to run Pure or Weistec or other aftermarket turbos and really try to squeeze every bit of power from the S63tu, the performance difference is going to be very minimal. When you are playing with 650+ horsepower, 10-15 hp isn't going to be very noticeable. With cats, you'll cut back on the smell substantially. My FD3s was catless and so is my turbo Elise. I smelled like gas and oil after driving the FD and I still smell like... car... after driving the Lotus. A lot of people can't handle that. For a DD, I wouldn't go catless. As mentioned though, catted downpipes cost more.

If you are super into the pops and bangs, you may want catless. But honestly, don't be into that. 🙊
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      02-25-2020, 01:46 PM   #12
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Quote:
Originally Posted by BadCompany View Post
Honestly, unless you are going to run Pure or Weistec or other aftermarket turbos and really try to squeeze every bit of power from the S63tu, the performance difference is going to be very minimal. When you are playing with 650+ horsepower, 10-15 hp isn't going to be very noticeable. With cats, you'll cut back on the smell substantially. My FD3s was catless and so is my turbo Elise. I smelled like gas and oil after driving the FD and I still smell like... car... after driving the Lotus. A lot of people can't handle that. For a DD, I wouldn't go catless. As mentioned though, catted downpipes cost more.

If you are super into the pops and bangs, you may want catless. But honestly, don't be into that. 🙊
Yeah my E60 M5 is catless and I always have to pull it outside the garage to warm up and my kids hate the smell. LOL But for that car, going catless is the biggest performance improvement with gains around 40hp.

So what's the ave gains for catted and catless downpipes on the S63tu? Is it only 10-15hp?
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      02-25-2020, 07:24 PM   #13
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I was referring to the difference from going from a good high flow catted version to catless.
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      02-25-2020, 09:38 PM   #14
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Quote:
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I was referring to the difference from going from a good high flow catted version to catless.
Gotcha.

Still wondering how much power downpipes add.
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      02-26-2020, 02:43 AM   #15
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That's harder to say since most people do a stage 2 tune at the same time. But, bm3 claims about an additional 4% hp and 3-4% tq mostly above 4,500 rpm compared to stage 1 (which is stock downpipes). They have an overlay of stock vs stage 1 vs stage 2 if you want to look at it.
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      02-26-2020, 08:40 AM   #16
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Quote:
Originally Posted by BadCompany View Post
That's harder to say since most people do a stage 2 tune at the same time. But, bm3 claims about an additional 4% hp and 3-4% tq mostly above 4,500 rpm compared to stage 1 (which is stock downpipes). They have an overlay of stock vs stage 1 vs stage 2 if you want to look at it.
Are you referring to the info on this page that shows the power increases for the different stages?
https://www.protuningfreaks.com/coll...-m5-m6-x5m-x6m

Was poking around for dyno charts but haven't found any for our cars.
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      02-26-2020, 01:22 PM   #17
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Yes. Stage 2 requires downpipes. That gives you a ballpark. I haven't been able to find a lot in the way of F85/6 dynos. There is more if you expand to other platforms running the S63tu. Part of the issue is the vast majority don't go from stock to downpipes and dyno. They tune at the same time... and most people don't seem to bother doing custom tunes on a dyno. They just do an OTS and call it a day. Those that do are running meth/ethanol, aftermarket turbos, etc. So if you are looking for what downpipes add on a stock tune for a F85/6, you likely won't find that info.

With that said, I saw one thread in the F10 forum where the person dynoed with decatted downpipes untuned and then tuned. He found only a 2hp gain peak. With a tune, a little more than stage 1. But, more area under the curve overall. There are some other F10 threads with various results. Not too many before and after without a tune. Most consider them a supporting mod.
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      02-26-2020, 06:06 PM   #18
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Understood. Guess I should have clarified that I already have the Stage 1 bm3 tune and wasn't thinking of just adding downpipes to a stock tune.

Looks like the 4% gain from Stage 1 to Stage 2 with downpipes is about 23hp (give or take):
(1.2*567)-(1.16*567) = 680-657

I know it's not that simple but probably a good estimate.
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