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      11-01-2020, 02:49 PM   #45
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Quote:
Originally Posted by les anderson View Post
300cel tend to be a heck of a lot more expensive.
Obviously you think that the above is for no reason..... as well as the fact that 200 cell are much more rare and come from much less reputable manufacturers than 300 cell....

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Sound clips also seem to tell that there is a significant difference in terms of sound with 200 cel not being raspy like catless but also much better sounding than 300.
I'd be very surprised if you can tell a difference between the sound of 200 cell and 300 cell.... This said, many (incl. myself) are concerned about the excessive sound (=noise) which comes with a sport DP, especially in combination with a cat-back exhaust system, like MPPSK or other. The borderline between "sound" and "noise" is very, very thin...

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Also, if 200cel is not throwing a cel and passes a sniff test (which they seem to in most cases) than it could be argued there is very little reason to pay for 300cel.
That's that... -->
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Originally Posted by les anderson View Post
Well, just got a cel for p0420, catalytic efficiency threshold, lol. Guess that settles that!
But all of that is not really what I asked... (And I'm not judging)
It was about some data available about the power improvement (or suppression) of a DP (or various cell DPs) in comparison to the stock DP. I recall something like 200 or 300 cell being much closer to catless (with % being quoted) in comparison to stock.
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Last edited by Skyhigh; 11-01-2020 at 03:07 PM..
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      11-01-2020, 06:03 PM   #46
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Quote:
Originally Posted by Skyhigh View Post
Actually, the difference between 200 and 300 cell (ref diagram above) is very small. What is more meaningful is that with 200 cell you no longer fulfill the environmental requirements, which (depending on where you live) creates more hassle than what 200 cell brings performance-wise over 300 cell.
Which is why I personally see 0 point in a 200 cell over 300 / catless. It simply combines the worst of both worlds.
My 200 cell downpipe doesn't throw a CEL. Hasn't for 3+ years. You get what you pay for.
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      11-01-2020, 09:07 PM   #47
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Not all CATs are created equal. HJS is top quality. If running that you may get away with it.
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      11-02-2020, 02:50 AM   #48
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Quote:
Originally Posted by MTWO View Post
Not all CATs are created equal. HJS is top quality. If running that you may get away with it.
Get away with what? HJS is a reputable manufacturer preferred by most of the top exhaust manufacturers and is 300 cell. Fully conforming with EURO 6. There is no "getting away" with HJS - it is the golden standard.
Of course quality comes with a price tag.
HJS's own DP seems to be the best value for money product on the market.
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      11-02-2020, 11:17 AM   #49
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HJS cats are the best in my opinion (used with fabspeed DP), GESI cats (used with active autowerke DP) are the best value option for a no CEL guarantee

if the car is tuned and/or the CEL is not a concern, CTS catted DP are the best value
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      11-03-2020, 06:02 PM   #50
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I don't see why CG downpipes aren't getting more consideration. They were one of the first B58 downpipes that didn't throw a CEL, and mine still doesn't. With a 5" diameter and 200 cell, you're getting nearly all of the gains of catless.
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      11-03-2020, 06:52 PM   #51
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Quote:
Originally Posted by G.Newt View Post
I don't see why CG downpipes aren't getting more consideration. They were one of the first B58 downpipes that didn't throw a CEL, and mine still doesn't. With a 5" diameter and 200 cell, you're getting nearly all of the gains of catless.
They are hard to come by.
So if I bought the CTS what oxygen spacer should I buy?

Last edited by 340iGUY; 11-03-2020 at 07:57 PM..
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      11-04-2020, 08:15 AM   #52
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Quote:
Originally Posted by G.Newt View Post
I don't see why CG downpipes aren't getting more consideration. They were one of the first B58 downpipes that didn't throw a CEL, and mine still doesn't. With a 5" diameter and 200 cell, you're getting nearly all of the gains of catless.
CG is very popular for us, but it takes weeks to ship
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      11-20-2020, 10:40 PM   #53
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Anyone know if it's safe to run ots burbles on BM3 Stg2 with the CTS catted dp? Their site says they don't warranty cats damaged by a crackle tune but also suggest running bm3 stg2.
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      11-21-2020, 07:25 AM   #54
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Originally Posted by leew102 View Post
Anyone know if it's safe to run ots burbles on BM3 Stg2 with the CTS catted dp? Their site says they don't warranty cats damaged by a crackle tune but also suggest running bm3 stg2.
I think it's safe, just keep it reasonable from a loud and time stand point.
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      11-23-2020, 12:01 PM   #55
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Quote:
Originally Posted by leew102 View Post
Anyone know if it's safe to run ots burbles on BM3 Stg2 with the CTS catted dp? Their site says they don't warranty cats damaged by a crackle tune but also suggest running bm3 stg2.
Default level should be fine
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      11-23-2020, 06:14 PM   #56
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Originally Posted by leew102 View Post
Anyone know if it's safe to run ots burbles on BM3 Stg2 with the CTS catted dp? Their site says they don't warranty cats damaged by a crackle tune but also suggest running bm3 stg2.
Stock BMW map is hella burbly. I'd make crazy gunshots FBO untuned. I think the OTS default is a tad bit tamed down from stock.
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      11-23-2020, 07:38 PM   #57
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Thanks guys, I might just have to go with the CTS catted down pipe. Looks like you can drive on it long enough (at least 700 miles if I am reading correct) so it will pass emissions here in NY and hopefully can handle the ots burbles of stage 2.

Quote:
Originally Posted by G.Newt View Post
Stock BMW map is hella burbly. I'd make crazy gunshots FBO untuned. I think the OTS default is a tad bit tamed down from stock.
Hmm, for me, the stock tune can get me a more louder pop but seems to be less frequent/less duration. On stage 1 OTS burbles, I get a lot smaller pops and for a little longer duration with the occasional loud pop, but nothing like the pop that it makes in stock tune (if that makes sense). Currently only have a awe midpipe and remus axleback.
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      11-23-2020, 10:06 PM   #58
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Quote:
Originally Posted by leew102 View Post
Thanks guys, I might just have to go with the CTS catted down pipe. Looks like you can drive on it long enough (at least 700 miles if I am reading correct) so it will pass emissions here in NY and hopefully can handle the ots burbles of stage 2.



Hmm, for me, the stock tune can get me a more louder pop but seems to be less frequent/less duration. On stage 1 OTS burbles, I get a lot smaller pops and for a little longer duration with the occasional loud pop, but nothing like the pop that it makes in stock tune (if that makes sense). Currently only have a awe midpipe and remus axleback.
I don't think you'll have much success unless you run an o2 spacer.
If you're tuned, you're disabling the catalyst ready monitor, and you will might fail depending on how strict your local emissions laws are. If you're allowed 1 or 2 not ready monitors, then you might be good.

CTS doesn't give a no CEL guarantee on this product and their product description recommends to use with a tune to ignore the CEL.
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      11-23-2020, 10:25 PM   #59
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Quote:
Originally Posted by G.Newt View Post
I don't think you'll have much success unless you run an o2 spacer.
If you're tuned, you're disabling the catalyst ready monitor, and you will might fail depending on how strict your local emissions laws are. If you're allowed 1 or 2 not ready monitors, then you might be good.

CTS doesn't give a no CEL guarantee on this product and their product description recommends to use with a tune to ignore the CEL.
So looks like NY allows for 1 monitor, not sure how many monitors won't be ready on the 340 for the cts downpipe...I can't seem to find a clear answer to how many for catted downpipes for the b58. But o well will be a problem for the future to figure out, just ordered a the catted downpipe I was hoping that since it looks like it might take more miles than the readiness procedure will take before the CEL light comes on, you could potentially just clear the codes, get the monitors in a ready state and then take it in to do inspection before the light pops again. First time going down the rabbit hole of modding a car so that assumption could totally be off basis there.
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