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BMW M8 Forum and 8 Series Forum BMW M8 and 8-Series General Discussion My M8 GC Comp with Resonator and Secondary Cat Delete-Pics and Video!

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      02-05-2021, 04:27 PM   #1
Vic55
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My M8 GC Comp with Resonator and Secondary Cat Delete-Pics and Video!

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Ok so most of you know that when I got the M8 GC, I removed the center section and replaced it with a straight pipe set up. The gain was in decibels, barks, and overall noise especially in the higher RPM's. But, I still wanted more and maybe that's because my R8 is so damn loud with its modded exhaust or just because a 600 plus hp car deserves to roar with pride

So once again- Ben aka r33_RGSport at RG Sport made special accommodations so I could show up well before his wake time (7am) LOL. I decided to go with the removal of only the secondary cats (primary will cause a CEL) to get even more sound. Ben suggested Evolution Racewerks Pipes (ER) and Ive only heard good things about them. The job took about 4-5 hours rack to unrack and I am extremely happy and NO welding- just OEM brackets.

I would say that on my drive home (60 miles) I was able to clearly open up the car to 140+ and run those rpm's up; the car is definitely louder under load (maybe 30-35% more) as the rpm's draw up. The barks and pops are crazier than ever on run downs and hard pulls. I was able to go under regular tunnels Ive visited before and there is no doubt the car is much louder. But its still docile at lower rpms and drone which is highly subjective does not hit my ears.

I like it- I like it alot!

So here are some pics I took plus Ben's cell phone YouTube. Keep in mind that the standstill vids are with a fully warmed engine and the car already had the resonator pull done in December. The soft limiter did hold the car back to 5k rpm's but thats fine; its parked. The one take off vid part gives you a better idea of the loud bark on up shifts but even then the car was not up to speed.

Here are the pics and vid:

This is the resonator delete- pretty clean:



The big ass OEM secondaries:



The ER bad boys:



OEM vs ER:



The vid- remember its an iphone and the 5k limiter but boy does the car rip with sound:



And what the fuck is this stupid thing (seen it on all M's) but what if we took it off? How much more sound or will it be annoying?

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Last edited by Vic55; 02-10-2021 at 03:36 PM..
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      02-05-2021, 04:39 PM   #2
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Looking good and sounds good.
Thank you for the business.
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      02-05-2021, 04:47 PM   #3
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Quote:
Originally Posted by r33_RGSport View Post
Looking good and sounds good.
Thank you for the business.
No, thank you sir.

Please provide coffee in the future.
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      02-05-2021, 05:01 PM   #4
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Quote:
Originally Posted by Vic55 View Post
Quote:
Originally Posted by r33_RGSport View Post
Looking good and sounds good.
Thank you for the business.
No, thank you sir.

Please provide coffee in the future.
Sounds and looks great! Good work r33_RGSport if I lived near your shop I'd be in trouble. But how come no coffee?
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      02-05-2021, 05:02 PM   #5
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Quote:
Originally Posted by Mgrae456 View Post
Quote:
Originally Posted by Vic55 View Post
Quote:
Originally Posted by r33_RGSport View Post
Looking good and sounds good.
Thank you for the business.
No, thank you sir.

Please provide coffee in the future.
Sounds and looks great! Good work r33_RGSport if I lived near your shop I'd be in trouble.
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      02-05-2021, 07:03 PM   #6
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Sounds fantastic. You make it so goddamn difficult on everyone to keep shit stock!!

Real badass though! Good job.
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      02-05-2021, 11:35 PM   #7
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The object in that last picture is a Helmholtz resonator:

https://en.m.wikipedia.org/wiki/Helmholtz_resonance

Reduces/eliminates drone and can be used to tune the exhaust sound/note.

Nice car and sound! 👍
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      02-06-2021, 06:31 AM   #8
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That sounds amazing Vic55 congrats!

r33_RGSport I might have to get at least one set of these, will dm you.
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      02-06-2021, 07:23 AM   #9
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Quote:
Originally Posted by xmanpro View Post
That sounds amazing Vic55 congrats!

r33_RGSport I might have to get at least one set of these, will dm you.
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      02-06-2021, 08:58 AM   #10
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Quote:
Originally Posted by Boss330 View Post
The object in that last picture is a Helmholtz resonator:

https://en.m.wikipedia.org/wiki/Helmholtz_resonance

Reduces/eliminates drone and can be used to tune the exhaust sound/note.

Nice car and sound! 👍
So Ill leave it or will the exhaust get ugly if I straight that?

Im bored as you can see
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      02-06-2021, 09:07 AM   #11
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Quote:
Originally Posted by Vic55 View Post
So Ill leave it or will the exhaust get ugly if I straight that?
I'd leave it. The volume/sound change you get from removing it will be next to nothing unless you drive around with the flaps closed most of the time. Given your quest for more sound (and I certainly don't blame you!) I think it's safe to assume you have the flaps open 24/7.

You are certainly getting the best bang for the buck sound with midpipe and secondary catless downpipes but you GOTTA hear the Akrapovic full Ti exhaust with secondary downpipes.

The Akrapovic doesn't just increase the volume, it changes the exhaust note and backfires to something much more exotic sounding. Videos don't do it justice either.
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      02-06-2021, 09:14 AM   #12
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Quote:
Originally Posted by Jenner View Post
I'd leave it. The volume/sound change you get from removing it will be next to nothing unless you drive around with the flaps closed most of the time. Given your quest for more sound (and I certainly don't blame you!) I think it's safe to assume you have the flaps open 24/7.

You are certainly getting the best bang for the buck sound with midpipe and secondary catless downpipes but you GOTTA hear the Akrapovic full Ti exhaust with secondary downpipes.

The Akrapovic doesn't just increase the volume, it changes the exhaust note and backfires to something much more exotic sounding. Videos don't do it justice either.
Oh I have no doubt about the Akra (had it when they were the M Performance provider on the F10 M5)--- I just dont think Ill keep the car long enough to justify it. I was the Remus sponsor child on the F90 and the tonal changes on that were impressive from down low to up top!

Plus I need to keep Ben in business

My exotic beast is the R8 V10 Performance with these sounds (almost the same but like you said videos dont justify) by Quicksilver in the UK:

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      02-06-2021, 02:40 PM   #13
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Vic, what about adding the Eventuri intake for some additional whoosh?


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      02-06-2021, 04:49 PM   #14
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wow sounds great

i might go this route when my m3cs lease is up and get into M8comp
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      02-07-2021, 08:34 AM   #15
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Quote:
Originally Posted by limeypride View Post
Vic, what about adding the Eventuri intake for some additional whoosh?


Oh no!!!
What have you done now.

Vic55 will text me today and asked me to order it for Monday installation.
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      02-07-2021, 09:43 AM   #16
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Quote:
Originally Posted by r33_RGSport View Post
Oh no!!!
What have you done now.

Vic55 will text me today and asked me to order it for Monday installation.
LOL

I think Im done.... I think.

Im on to a new project
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      02-07-2021, 01:10 PM   #17
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Quote:
Originally Posted by Vic55 View Post
Quote:
Originally Posted by r33_RGSport View Post
Oh no!!!
What have you done now.

Vic55 will text me today and asked me to order it for Monday installation.
LOL

I think Im done.... I think.

Im on to a new project
Ooooooh what's next?
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      02-07-2021, 08:52 PM   #18
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Any check engine light on the secondary delet??
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      02-07-2021, 09:03 PM   #19
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Any check engine light on the secondary delet??
Nope. Only on the primaries.
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      02-08-2021, 04:40 AM   #20
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Quote:
Originally Posted by Jenner View Post
Nope. Only on the primaries.
Thanks
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      02-08-2021, 09:14 AM   #21
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very nice. ill be going this route soon, already running secondary cat deletes and the noise went up about 5 %, way too subtle but this seems like the perfect combination.

Any drone at all?


And thank you for posting this video!
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      02-08-2021, 09:20 AM   #22
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Quote:
Originally Posted by Quinn A View Post
very nice. ill be going this route soon, already running secondary cat deletes and the noise went up about 5 %, way too subtle but this seems like the perfect combination.

Any drone at all?


And thank you for posting this video!

Thanks.

Drone is highly subjective as you will agree. What one man deems to be annoyance, I might associate it as engine noise. In this process I really dont find there to be much low level "drone" just an increase in the internal rumble/exhaust noise at idle or at lower cruising rpms.

My best subjective thoughts are the car is the same unless I rip it up to higher rpms or downshift to create more bangs.
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