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Discussion Starter #1 (Edited)
Hey all,

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

F10 M5 RPi GTM Exhaust with Custom Fully Catless Downpipes. LOUDEST F10 M5 in the world! - YouTube


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.

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.
 

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I'm sure you were expecting more responses, hellooooo m5board, where you at???

I'd love to be able to pickup 50hp with minimal tinkering, that's awesome. But, for me, the car is just loud. It doesn't sound that great. Of course, many factors are in play here, computer speakers, microphone etc, that perhaps the true noise doesn't get delivered via youtube. I should add - I thought it sounded SUPER HOT with just the RPI muffler delete.

From my perspective - E60 M5 Exhaust > Dave's Beast F10 M5

:D
 

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Discussion Starter #5 (Edited)
Any CEL's? No cats meaning O2 sensors go haywire. Did you tune it to get rid of the CEL or your just ignoring it?
Just ignoring the CEL for now. I put a sticker on the instrument cluster so I'm no bothered by it.

There is currently no aftermarket ECU tune out that will delete the CEL that I know of. I'm waiting for ESS to come out with their tune at some point this summer which will delete the CEL and also remove the top speed limiter. Being patient for now. :cool:

BTW the stock ECU tune takes about 500 to 1,000 miles to fully adjust to the catless downpipes. At first when I put them on the ECU was really confused and it felt like I lost power and torque. After I drove a lot of miles, it was like one day the M5 woke back up and was super powerful.
 

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Dave your Crazy!!!!
Good for you my friend, I got the Gtm muffler
Delete and think it's really loud and sounds
A lot nicer in person than on YouTube.
I can't imagine how yours sound in person.
Anyways very nice and cheers!!!
 

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Discussion Starter #7
Dave your Crazy!!!!
Good for you my friend, I got the Gtm muffler
Delete and think it's really loud and sounds
A lot nicer in person than on YouTube.
I can't imagine how yours sound in person.
Anyways very nice and cheers!!!
Thank you my friend. It's great to finally see someone post who actually knows what an RPi GTM Exhaust sounds like in real life. Since you understand the GTM, trust me when I tell you that with fully catless downpipes, the F10 M5 is just a monster now. I was hoping that people trusted my experience when I tell them that I used to own a straightpiped E60 V10 and that when I say that my 100% straightpiped F10 M5 now sounds louder and my opinion in some ways better, than the straightpiped E60 V10, people tend to discredit what I am saying for no apparant reason other than sticking with their beliefs that nothing will ever sound better than the S85 with an exhaust on it.

I truly wish that everyone could hear my F10 M5 in real life. Even though I bought a lot of new audio/video equipment to produce this new video, which by the way is my best work yet, nobody can really understand until you feel the shock wave of the crack of an upshift on my F10 M5 right next to you in real life. It's just prodigious.

The F10 M5 is truly a monster. I just can't wait to get a proper ECU tune and start beating on GTR's on the regular. Lol! :cool:
 

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Thank you my friend. It's great to finally see someone post who actually knows what an RPi GTM Exhaust sounds like in real life. Since you understand the GTM, trust me when I tell you that with fully catless downpipes, the F10 M5 is just a monster now. I was hoping that people trusted my experience when I tell them that I used to own a straightpiped E60 V10 and that when I say that my 100% straightpiped F10 M5 now sounds louder and my opinion in some ways better, than the straightpiped E60 V10, people tend to discredit what I am saying for no apparant reason other than sticking with their beliefs that nothing will ever sound better than the S85 with an exhaust on it.

I truly wish that everyone could hear my F10 M5 in real life. Even though I bought a lot of new audio/video equipment to produce this new video, which by the way is my best work yet, nobody can really understand until you feel the shock wave of the crack of an upshift on my F10 M5 right next to you in real life. It's just prodigious.

The F10 M5 is truly a monster. I just can't wait to get a proper ECU tune and start beating on GTR's on the regular. Lol! :cool:
I doubt it's a case of people not trusting your experience, and more so of people just not sharing the same taste. The power is great, the noise is ridiculous. I'm all for having great sounding cars, but this thing is unbelievably loud, to the point of being overly obnoxious. It works for you and some others, but not for everyone.

Greatly admire your continual modding of your car though :) gotta love the passion behind trying to get more and more out of it. Keep it up Dave, I'd love to hear this thing in person since we're both in San Diego. Shoot me a PM if you plan on attending any local car events soon.
 

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Discussion Starter #9
I doubt it's a case of people not trusting your experience, and more so of people just not sharing the same taste. The power is great, the noise is ridiculous. I'm all for having great sounding cars, but this thing is unbelievably loud, to the point of being overly obnoxious. It works for you and some others, but not for everyone.

Greatly admire your continual modding of your car though :) gotta love the passion behind trying to get more and more out of it. Keep it up Dave, I'd love to hear this thing in person since we're both in San Diego. Shoot me a PM if you plan on attending any local car events soon.
Yes I'm thinking about going up to Irvine Cars and Coffee this next Saturday morning. We always meet in Carlsbad first before we head up. Then on Sunday I'm doing our local SD CCA BMW car cruise for fun. Let me know if you want to meet up with me for any of these. It's always more fun to roll with more M5s. :cool:
 

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The sound shockwave from the vid is making my hands ssss... Hhhhh...akes ... Shake
Amazing :applause:
The neighbors must be loving you
Congrats to have a better sound than the old v10 and moving from you means that sound must be off the chart
Have fun out there and show those exotics what the car is packing
Take no prisoners
 

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Well it's time for me to go to the restroom, I have a little mess I need to clean up :cool_shades:. I love your car and the way it sounds man, ****s BEAST! Hoping to pick up a 2014 Competition sometime next year, maybe around taxes. Will be going the same route, straight pipes FTW!
 

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Haha Dave. Glad you liked that road/run I showed you in Temecula. It must have left an impression for you to go back and film on it. :M5launch:
 

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That. Sounds. PERFECT!!!! Bravo! That is exactly how a TT V8 should sound - menacing! Love hearing those turbos spool up so loudly.
 

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Yes they do! Love them!


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