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      05-28-2013, 09:33 PM   #1
RPiM5
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Talking F10 M5 RPi GTM Exhaust: With Fully Catless Downpipes Now! - (I went Full Retard)

Hey all,

I just finished producing my newest video of my F10 M5.


The catless downpipes combined with the RPi GTM (Muffler Deleted) exhaust system has now made my F10 M5 the first in the world to be 100% Fully Straightpiped. We're talkin NO cats, NO resonators, and NO mufflers whatsoever. What you will hear in this video is pure unadulterated engine and turbo sound from the S63tu platform. The catless downpipes have utterly changed the entire character of the F10 M5 and it's incredible. I would like to reiterate for a moment that I used to own a Full RPi Stage 2 E60 M5 (also straightpiped) and the straightpiped F10 M5 is as good and better than the note of the straightpiped V10 in the E60. The performance gains from the straightpiped F10 M5 don't even compare to the straightpiped E60 M5, the F10 M5 completely blows the E60 away in the performance gain department. As you will see I have made huge power and torque gains. I have about 1000 miles on the M5 with the new downpipes already and I can honestly honestly say that I don't think I will EVER go back to get another V10 just for the F1 exhaust note that I miss.

Also just for some comparisons, I did an exhaust off 2 weekends ago with my friends fully straightpiped Lamborghini Gallardo Superleggera (still to this day the absolute loudest car I have ever heard) and my F10 M5 was only slightly quieter than his Superleggera. If his Lambo was on a scale of 1-10, an resounding 10, then mine was easily a 9.5. It's that LOUD! My F10 M5 was even louder than the IND F10 M5, which also has fully catless downpipes from AMS, and a full Eisenmann Race Exhaust on it. The IND F10 M5 was also very loud, but the note was a lot cleaner and a lot more refined but had no burble in it like my exhaust does or a V10 does.

A while ago I made an exhaust loudness comparison thread. It now needs to be updated. Here's the new list:

1: F10 M5 Stock Exhaust (Although the crack from the stock exhaust is louder than most other aftermarket exhausts, I think it may be because the stock mufflers are actually smaller than a lot aftermarket ones)
2: RPi GTS Exhaust / Akropovic Exhaust
3: F10 M5 Eisenmann Sport (Mufflers Only)
4: F10 M5 RPi GT Exhaust / F10 M5 Supersprint Exhaust (Mufflers Only)
5: F10 M5 Eisenmann Race Exhaust (Mufflers Only)
6: F10 M5 Meisterschaft GT Exhaust
7: F10 M5 RPi GTM Exhaust (The Cracks from the exhaust will actually hurt your eardrums though) / E60 M5 RPi GTS Exhaust
8: E60 M5 RPi GT Exhaust / E60 M5 Eisenmann Race Exhaust / E92 M3 RPi GTM Exhaust.
9: E60 M5 RPi Stage 2 with Full GT Headers and GT Exhaust / Almost any E60 with Headers and Exhaust / Straightpiped Merc C63 / Straightpiped Aston DBS / Straightpiped Lexus ISF / F10 M5 with AMS Catless Downpipes and Full Eisenmann Race Exhaust
9.5: F10 M5 with Catless Downpipes and RPi GTM Exhaust
10: Straightpiped Lamborghini Gallardo Superleggera / Straightpiped Porsche Carrera GT / Straightpiped Lambo Aventador


Now you might be wondering where did I get my catless downpipes from. I basically wanted to try some catless downpipes that a custom shop in LA makes called Motiv Concepts since the RPi GT Catless Downpipes are still in development, I figured I'd give these a try. Notice the pipes have no kinks in them, instead they are a smooth flowing design. I had my downpipes ceramic coated with black coating as well. In case you are wondering, Motiv Concepts does not have these downpipes in production. They are a special order set, so you will have to call them yourself if you want them made also. I don't know how much they will charge you either, so you will just have to call them and find out.

Also notice the stock downpipes and how clunky and sloppy they look.

The last picture is with the catless downpipes installed. Installation was pretty easy, only took about 2 1/2 hours, but this was only because they did another F10 M5 before mine once, and they had experience on what to do.

The 1st dyno chart pictured below shows the BLUE line and the RED line. The BLUE line is my baseline that I did with ONLY my GTM exhaust and Charcoal Filter Delete. The RED line is with the Catless Downpipes. Notice the gains pretty much all over the rev band and the huge gains in the mid-range. Looks like about 50hp and 50tq to the wheel in the mid-range! On run 16 I actually made 554whp though, which was my highest peak hp of the day. You can feel it too.

The 2nd dyno chart pictured below is my (RED) Catless Downpipe dyno compared to another customer's (who was at EAS that day) C63 AMG with a COBB tune (BLUE). You can see how my power and torque band just murders the C63 AMG's all day and all night, even with his tune.

I also let M54ccibo and Rob///M5 both drive my car with the catless downpipes and they loved it. One of them said and I quote "Dude, your car is now Full Retard, it sounds like an ALL OUT Racecar now," the other said this "dude, after I rode in your M5 and then got back into mine, my M5 sounded like I was driving a hybrid." LOL!



And YES I do get a CEL in my instrument cluster because I don't have a tune yet. I just put a sticker over the light and now it doesn't bother me. I will be waiting for the ESS tune to come out which should offer the CEL light delete and the Top Speed Limiter Removal in conjunction with massive power gains.

Here is the new video!

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Last edited by RPiM5; 05-28-2013 at 10:10 PM..
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      05-28-2013, 10:31 PM   #2
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all I can say is damn.
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      05-28-2013, 10:33 PM   #3
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DAYUM
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      05-28-2013, 10:48 PM   #4
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What was the damage for the dp's? Pm me
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      05-28-2013, 11:06 PM   #5
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Outstanding!!!
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      05-28-2013, 11:36 PM   #6
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Good god almighty what in the hell?!! That sounds flipping insane!!!! FUCK!! I bet the cold starts are a bit unsettling lol
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      05-29-2013, 01:15 AM   #7
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Stupid Loud Lmao.
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      05-29-2013, 01:28 AM   #8
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That's amazing
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      05-29-2013, 01:42 AM   #9
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Here's the side by side race from the other angle.

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      05-29-2013, 05:01 AM   #10
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Sounds great man. I like the fact that you can hear the turbos. It has a good sound that is mean. Inside the car sound proof still works as I think it is not over the top. The fun factor has me seeing you grin from ear to ear from Texas. This is great Dave. You now have a freak from nature.
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      05-29-2013, 06:35 AM   #11
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Impressive! And let me say that I for one appreciate guys like you that are willing to test, document and share results of performance mods.

Thanks!
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      05-29-2013, 07:18 AM   #12
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that sounds mean as hell . congrats man and enjoy.
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      05-29-2013, 07:39 AM   #13
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Quote:
Originally Posted by RPiM5 View Post
Also just for some comparisons, I did an exhaust off 2 weekends ago with my friends fully straightpiped Lamborghini Gallardo Superleggera (still to this day the absolute loudest car I have ever heard) and my F10 M5 was only slightly quieter than his Superleggera. If his Lambo was on a scale of 1-10, an resounding 10, then mine was easily a 9.5. It's that LOUD!
Sick! So I have to ask - and I realize this may be missing the point.. Do you get drone in the cabin?

Have you done any runs against your buddy's Lambo? That would be fun to see...
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      05-29-2013, 07:49 AM   #14
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Quote:
Originally Posted by Charlie Brown View Post
Impressive! And let me say that I for one appreciate guys like you that are willing to test, document and share results of performance mods.

Thanks!
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      05-29-2013, 08:10 AM   #15
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Impressive Dave...do you have any odor of being catless?
You can tell your beast pulls hard on the vid!
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      05-29-2013, 09:40 AM   #16
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Wow!!!!! So what are the final power gains by adding the downpipes? I see two dyno charts, each with two runs, but showing drastically different deltas.

edit: Sorry, just watched the beginning of the video again and missed it the first time. 50hp/50 lb.ft. is terrific.
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      05-29-2013, 09:46 AM   #17
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Quote:
Originally Posted by Scott_in_FL View Post
edit: Sorry, just watched the beginning of the video again and missed it the first time. 50hp/50 lb.ft. is terrific.
And that's to the wheel!
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      05-29-2013, 09:49 AM   #18
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Quote:
Originally Posted by Fly M5 View Post
Impressive Dave...do you have any odor of being catless?
You can tell your beast pulls hard on the vid!
Yes, there is odor from the engine fumes now. BUT!!! It is not nearly as bad as the E60 V10's straightpipes smell. The fumes from catless F10 V8 are about 80% less obtrusive than the E60 V10's fumes.

You can only really smell the fumes on the F10 M5 when stopped at a traffic light. On the V10 you couldn't even hang out in your garage for a minute after shutting off the car, on the F10 M5 you can hang out all day. It's really not nearly as bad at all.
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      05-29-2013, 09:57 AM   #19
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Quote:
Originally Posted by dhirm5 View Post
Sick! So I have to ask - and I realize this may be missing the point.. Do you get drone in the cabin?

Have you done any runs against your buddy's Lambo? That would be fun to see...
On the issue of drone. The drone range is still present from the original RPi GT Exhaust system, because of the resonator delete. Like I have stated before, the drone range with the RPi system is from exactly 1,600rpm to 2,000rpm. When I deleted the mufflers with the GTM system a brand new drone range appeared from 2,800rpm to 3,000rpm, but that one sounds SO good. However with the Downpipes both drone ranges are simply only amplified. So it is a bit louder on the inside, but again if you just keep the rpm's out of those ranges, then there is absolutely no drone.

As for racing my friends Lambo, this is an older video I shot when I only had the RPi GT Exhaust system installed. He has the Superleggera with the 523hp version, but he's still about 1,000lbs lighter than me. Lol!

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      05-29-2013, 10:26 AM   #20
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On the other side of the spectrum. Let's look at what the competition has in store for us.



Pretty weak if you ask me. Sounds 100% stock to me. Lol!
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      05-29-2013, 10:44 AM   #21
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Would love to hear a cold start on this setup. Nice work Dave. Sounds so mean and beastly, I cant even imagine what it is like in person.
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      05-29-2013, 11:01 AM   #22
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If an F10 M5 drives catless/mufflerless/resonatorless thru a forest, does it make a sound?






Hell fucking yeah!!!!!
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