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Seriously considering the RPI Exhaust

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AndyT
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Seriously considering the RPI Exhaust

Post by AndyT » Sun Jul 11, 2021 10:38 am

Only had the Z4M Roadster a week but already starting to get quite a list of things that I want to do to bring it back to all its glory including

New badges all round
Refurb/replace alloys
Replace drivers cup holder as arm broke :cry:

But although I love the sound, I just feel it needs more especially as it’s not a daily. From all the videos and write ups I’m pretty sure it’s the RPI exhaust I’m looking for, especially as it seems to just turn the same sound up to 11 or even 12 whereas a lot of the others seem to totally change the sound which I don’t want.

Does anyone have the RPI installed and your thoughts, also I may look to go the evolve carbon intake at some point so interested if anyone’s gone down that route as well.
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--- Currently - 2007 Z4MR

--- Previous BMWs - Z4 M40i First Edition, Z4 2.5i Sport, 430d xdrive Coupe, 330i Coupe, 525i, 540i, Z4 2.5i, 330ci Convertible, Z3
--- Plus over 40 non BMWs inc. S2000, Focus ST, Octavia VRS, RS3, MINI JCW

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-Tom-
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Seriously considering the RPI Exhaust

Post by -Tom- » Sun Jul 11, 2021 11:40 am

I can’t comment on rpi, but I went down the route of supersprint race. Like you, it’s not a daily and for me it totally transformed the car. I couldn’t have it as a daily, but for its use, it’s how it should be for me!
-Z4 M Coupe, Silver Grey, Imola Red Nappa, carbon leather, CSLs, SuperSprint Race, Track Mode Enabled
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AndyT
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Seriously considering the RPI Exhaust

Post by AndyT » Sun Jul 11, 2021 2:33 pm

-Tom- wrote: Sun Jul 11, 2021 11:40 am I can’t comment on rpi, but I went down the route of supersprint race. Like you, it’s not a daily and for me it totally transformed the car. I couldn’t have it as a daily, but for its use, it’s how it should be for me!
Thanks Tom, a little reassurance I’m not mad :rofl:
--- Currently - 2007 Z4MR

--- Previous BMWs - Z4 M40i First Edition, Z4 2.5i Sport, 430d xdrive Coupe, 330i Coupe, 525i, 540i, Z4 2.5i, 330ci Convertible, Z3
--- Plus over 40 non BMWs inc. S2000, Focus ST, Octavia VRS, RS3, MINI JCW

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Seriously considering the RPI Exhaust

Post by john-e89 » Sun Jul 11, 2021 3:25 pm

AndyT wrote: Sun Jul 11, 2021 2:33 pm
-Tom- wrote: Sun Jul 11, 2021 11:40 am I can’t comment on rpi, but I went down the route of supersprint race. Like you, it’s not a daily and for me it totally transformed the car. I couldn’t have it as a daily, but for its use, it’s how it should be for me!
Thanks Tom, a little reassurance I’m not mad :rofl:
Just a cheeky nudge Andy, I have a pair of mint Supersprint back boxes if you’re interested at any point. :thumbsup:
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Rossm09
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Seriously considering the RPI Exhaust

Post by Rossm09 » Sun Jul 11, 2021 4:38 pm

I too am the same as you!
Recently picked up a Z4MR and it’s a weekend toy and want to replace the exhaust and the RPI is certainly a consideration!

AndyT
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Seriously considering the RPI Exhaust

Post by AndyT » Sun Jul 11, 2021 5:40 pm

Rossm09 wrote: Sun Jul 11, 2021 4:38 pm I too am the same as you!
Recently picked up a Z4MR and it’s a weekend toy and want to replace the exhaust and the RPI is certainly a consideration!
This guy has a few YouTube videos with the RPI as well as the Evolve Air Box on some later vids. Just so difficult to gauge how loud it is in real life :headbang:

https://youtu.be/8i0RLro4Hmw
--- Currently - 2007 Z4MR

--- Previous BMWs - Z4 M40i First Edition, Z4 2.5i Sport, 430d xdrive Coupe, 330i Coupe, 525i, 540i, Z4 2.5i, 330ci Convertible, Z3
--- Plus over 40 non BMWs inc. S2000, Focus ST, Octavia VRS, RS3, MINI JCW

Rossm09
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Seriously considering the RPI Exhaust

Post by Rossm09 » Sun Jul 11, 2021 9:19 pm

Watched a few of his YouTube videos and in fact the reason I really want the evolve airbox!!

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Seriously considering the RPI Exhaust

Post by Beedub » Sun Jul 11, 2021 9:23 pm

first 30 seconds then my son started to cry so had to slow down :rofl: :rofl: this car frightens him.

https://youtu.be/VZhzGCNpUrg

RPI, love and hate relationship.... sound awesome!! but sadly ..... in some ways they are that loud that driving the car is often a pain... plus EVERYONE looks at you. I love the weight savings they offer.
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Mr Tidy
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Seriously considering the RPI Exhaust

Post by Mr Tidy » Sun Jul 11, 2021 11:47 pm

I don't know anything about the RPI but when I bought my MC it had Powerflow back boxes already fitted, and they up the volume just enough for me. Plus the tailpies are a bit larger so they fill the spaces in the bumper a bit better! There is a bit of drone around 2,000 rpm but as that's typically around 50mph in 6th it's easy enough to drive around when it starts to get annoying.

I have wondered about other intakes like Gruppe M, Eventuri, etc. but I wouldn't want intake volume to drown out the exhaust, so I'll stick with what I have. If the intake did dominate the exhaust it would be an expensive mistake!

Now we are allowed out and about a bit more it would be ideal if you could find a forum member who has one or other of those alternatives fitted as a video is no substitute for 1st hand expereince.

Anyway I hope you find a solution you like. :thumbsup:
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Seriously considering the RPI Exhaust

Post by ga41 » Mon Jul 12, 2021 6:31 am

I too have the RPI's. It's certainly divisive. They are amazeballs when you're on it on some deserted B road :driving: but annoying as f**k when you're on a motorway cruising :headbang:

If you have the chance to hear them live then I would definitely urge you to do so. They really are on another level compared to stock....
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AndyBeech
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Seriously considering the RPI Exhaust

Post by AndyBeech » Mon Jul 12, 2021 8:02 am

Intake noise on these car's is so much better than any exhaust noise you can get on them IMO. I've still yet to hear an S54 exhaust video that actually sounded particularly good to me, intake on the other hand :evil:

I would go for a carbon airbox and save your money on the exhaust, will sound far more exotic :wink:
Z4MR - Gruppe M, Bilstein PSS10, CSL's + 18" CSL reps with semi's, RTAB Limiters, Powerflex’d, PF Camber Arms, K-Sport BBK / RSL-29, GC Camber Plates, Strut Brace, Exhaust valves, custom brake cooling, complete underside refresh!

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Iggy
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Seriously considering the RPI Exhaust

Post by Iggy » Mon Jul 12, 2021 9:51 am

There's an M roadster with an RPI near where i live and every time it drives past you have to stop your conversation and wait for it to go... it's that loud. Each to their own of course but it doesn't sound good to my ears, at least not from the outside.

I've got a Gruppe M and have to agree with Andy - the intake noise is sublime and, for me, is far more emotive than exhaust sound. I'm actually glad the stock back box is so quite so it doesn't interfere with the intake noise :lol: . If i were to consider an aftermarket back box it would probably be a Powervalve BCS just because it tries to limit the noise until you really go for it, apparently with less drone at motorway speeds (they claim no drone).
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ga41
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Seriously considering the RPI Exhaust

Post by ga41 » Mon Jul 12, 2021 9:55 am

I dare anyone to briskly drive a Z4M with RPIs up a twisty mountain road and not giggle like an idiot when you first downshift and put the pedal to the metal. I've had mine for 10 years now and I still smile every single time. :lol:

Again, it's 100% NOT for everyone! But when it works it works really well
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Seriously considering the RPI Exhaust

Post by Iggy » Mon Jul 12, 2021 10:08 am

ga41 wrote: Mon Jul 12, 2021 9:55 am I dare anyone to briskly drive a Z4M with RPIs up a twisty mountain road and not giggle like an idiot when you first downshift and put the pedal to the metal. I've had mine for 10 years now and I still smile every single time. :lol:

Again, it's 100% NOT for everyone! But when it works it works really well
If i had access to twisty mountain roads i might change my opinion :D
However, driving around where i live i might get chased by angry farmers an locals with pitchforks :rofl:
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Bombardino
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Seriously considering the RPI Exhaust

Post by Bombardino » Mon Jul 12, 2021 11:06 am

As mentioned by Iggy Powervalve come highly rated, It just so happens I have a set in my garage if your interested.

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