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01-08-2020, 10:10 AM | #1 |
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Z4 M: Euro section 1 vs US section 1: sound level
Does anyone know if switching from the US section 1 to the Euro section 1 would make the exhaust quieter due to having more cat material? How much quieter?
Context - I have catless headers (status gruppe) with US Section 1, oem resonator. When I run SS Powerloops there is some drone. I've read a few posts that say there should not be any drone with stock configurations, both US and Euro. SS support suggested it might be because of the larger euro cat. I'm trying to see if there's any credibility to that theory. If so I might pick up euro cats. Alternatively, add in a resonator, but I'm not sure I want to do custom work as it might take a few tries to get it right. |
01-08-2020, 10:49 AM | #2 |
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SS support is saying no drone with US/Euro Section 1 AND catless headers? I would find that hard to believe, most of the tone change and volume increase is due to catless headers (of any brand).
In my opinion any reduction from a Euro Section 1 would be minimal and not worth the cost and effort to swap out. The Euro Section 1 is not super easy to come by and requires you to cut into the wiring loom and re-route/extend the O2 sensors. |
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01-08-2020, 10:51 AM | #3 | |
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No they're saying there's no drone with the stock US and Euro configs. Here's the response:
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01-08-2020, 10:58 AM | #4 |
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I'm considering the euro section 1 option at this time because there's on available in the classifieds, and i have an upcoming diff service which requires the exhuast to be dropped anyway so it's convenient.
Regarding the rerouting of the post-cat o2 sensors, that to me seems like a good thing because it'll make the car emissions compliant which should help on resale. |
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01-08-2020, 11:04 AM | #5 | |
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Yes the Euro Section 1 installation and routing is not difficult, just tedious - I completed it myself last winter. |
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01-08-2020, 12:42 PM | #6 |
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Did you throw the SS back on the car? Switching to Euro section 1 won’t yield that much more improvement. I really think you need muffler inserts (similar to what RPi owners do) or add resonators.
I forgot are you relying on software or hardware to pass emissions? If the former, maybe you could just plug o2’s back into primaries and replace the section 1 cats with Aero resonators like the m3 folks. |
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01-09-2020, 03:34 AM | #7 |
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pretty sure the Euro section has LESS material in it than the US section, i think you may have got that the wrong way around. on another note, i cant wait to see how your going with your build mate
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01-09-2020, 06:47 AM | #8 |
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Thanks for the input everyone.
I didn't realize the status gruppe headers could be louder/more droney than the euro headers due to material/routing differences. 2.25" diameter. 304 stainless steel. They are routed differently. 3002 tii my plan is software but I do want to run some cats anyway. Thanks for the tip re aero resonators. Vanne, a bunch of forum posts say that the euro section 1 has a physically larger cat material housing (which acts as a resonator) and inside the material is longer (the us material stops shorter). It makes sense because the US section 1 is secondary cat, where as Euro is primary. But please correct me if I'm wrong. |
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01-09-2020, 07:38 AM | #9 | |
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Re section 1 differences I do believe you’re correct in that Euro has a denser cat. |
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01-09-2020, 07:53 AM | #10 |
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Agree. I did not modify my US Section 1. all o2 sensors plugged into the SG headers. secondary o2 is ignored via tune
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01-09-2020, 11:03 AM | #11 | |
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What did you do with the Remus? |
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01-09-2020, 11:10 AM | #12 |
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I have the remus on the car right now, powerloops in storage, I would love to put the powerloops back on and sell the remus... If only I could get the powerloops down to civilized levels...
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01-09-2020, 02:46 PM | #13 | |
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I don't know if that makes any measurable difference to sound or performance. Theoretically you would think it to be a little bit less of both. eg |
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01-09-2020, 07:19 PM | #14 |
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Thanks for the suggestions! I wonder how custom work ends up being cheaper though. I don't plan to experiment with headers since that's a lot of labor. But the section 1 seems practically free since I have to do a diff service anyway. The euro section 1 should hold its value so I'll only lose on shipping if it doesn't work. I think that's worth a shot before asking a shop to do custom work which I estimate will run me $300-400 in the best case scenario and result in my OEM exhaust parts getting chopped up? I don't quite believe the SGT headers are much louder/more droney than stock euro headers.
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01-12-2020, 05:14 PM | #15 |
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SS cans are back on my car. They seem tolerable for now. Full update in this post:
https://www.zpost.com/forums/showpos...4&postcount=16 Thanks for the advice! Appreciate it. |
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