Exhaust question

P

pHilli0

Active member
 Bedford
I know this has been discussed many times before but just want to recap as I am looking at exhaust options. Currently got stock and love the sound just far too quiet. The car is used for weekends and track days. So I need something to pass a track test but is loud enough to get the blood pumping in the coupe, but will allow the eventuri to be audible. May be looking for impossible..

From memory I can think of
REMUS - back boxes, stock soundish but 40% louder, quite popular, £950 new or £450 used..more suited for daily than track day blast?
Supersprint race - seems on the loud sound, not sure if this will overwhelm the eventuri, but may be ideal for track days?
Supersprint Powerloop - Speaking to Immran at Evolve this is his recomendation for more noise but no drone, would consider it..?
Eisenmann - seem more expensive from what i have found, but dont know anything about them...
Hayward & Scott - back boxes, seen mixed reviews on build quality but some people seem to love them, loud
RPI - we all know how loud these are, probably bottom of the list as I fear they are too loud for track days
BCS boxes - from the forum vids seem to be good quality, I wasn't in love with the recorded sound, maybe just audio issue but not convinced
What have I missed?
 
Can highly recommend Stromung. Sounds stock, just louder. Not intrusively loud, and I can still hear my AFE intake.
 
Phil, my ss race usually measures 85db, so well within most circuit limits. It's a fantastic noise full chat, I've had many compliments from those outside, not overly loud but a lovely tone. Also the pipes at the back are not much bigger than oem which I like. Inside the coupe though it's a different story, so loud that it almost balances the noise from my csl box and like many of these after market boxes it does drone around 2.5 k particularly in the coupe I suspect.. There's some pretty fruity over run pops and crackles also :) It's a little embarrassing in town tbh but as you say the oem really is quiet. On balance since I rarely drive in town I'm very happy with it.
Whilst I realise videos are a bit pointless as they don't tell the whole story here's one from mine when I was trying to fiddle around with new phone mounts recently. Haven't had a chance since to get on track and do it properly.
 
I can definitely say that the Remus is no where near 40% louder than stock. It's more like 10%. 15% if I'm being generous.
 
Thanks everyone for your thoughts. Tom, interesting reading hehe!! Sounded pretty good, not too deep or farty from the clip.
 
I'm going down the route of the 3/4" bypass pipes on the standard back box. £38 delivered and I'll use a local stainless welder to fit them having removed the back boxes. I like the fact that reviews on here all mention their is no boom or drone and that it keeps the oem look. Possibly not loud enough for some but I also want to make sure it will pass all trackday noise limits and not drown out the induction noise, will report back once fitted in a couple of weeks. :)
 
Fishy Dave said:
I'm going down the route of the 3/4" bypass pipes on the standard back box. £38 delivered and I'll use a local stainless welder to fit them having removed the back boxes. I like the fact that reviews on here all mention their is no boom or drone and that it keeps the oem look. Possibly not loud enough for some but I also want to make sure it will pass all trackday noise limits and not drown out the induction noise, will report back once fitted in a couple of weeks. :)
Click to expand...

I did the internal mod through Machine Monkey. Not taking anything anyway from his work which was excellent, but it sounded awful above 2000rpm!! It was embarrassing to drive it, good for fuel economy though as I wouldn't dare rev it past 2k rpm in town :) That said, the chap that bought them off me liked it.

Since fitted a Stromung exhaust and it sounds excellent, much deeper and quite a bit louder which some cheeky pops and crackles on the over run. All OEM+ 30% I'd say. Tail pipes look excellent too.
 
I have Supersprint exhausts and straight pipes....
Sounds great, and runs beautifully smooth and quick....
 
gwatson said:
Fishy Dave said:
I'm going down the route of the 3/4" bypass pipes on the standard back box. £38 delivered and I'll use a local stainless welder to fit them having removed the back boxes. I like the fact that reviews on here all mention their is no boom or drone and that it keeps the oem look. Possibly not loud enough for some but I also want to make sure it will pass all trackday noise limits and not drown out the induction noise, will report back once fitted in a couple of weeks. :)
Click to expand...

I did the internal mod through Machine Monkey. Not taking anything anyway from his work which was excellent, but it sounded awful above 2000rpm!! It was embarrassing to drive it, good for fuel economy though as I wouldn't dare rev it past 2k rpm in town :) That said, the chap that bought them off me liked it.

Since fitted a Stromung exhaust and it sounds excellent, much deeper and quite a bit louder which some cheeky pops and crackles on the over run. All OEM+ 30% I'd say. Tail pipes look excellent too.
Click to expand...

We're talking about two separate modifications I think? The bypass pipes are a singles, small 3/4" stainless pipe running externally above each back box that does not alter or open up the internals of the back boxes. http://www.z4-forum.com/forum/viewtopic.php?f=9&t=58956&p=866843&hilit=bypass+pipes#p866843


I think the Machine Monkey system opens the boxes up and tinkers with the internals http://www.z4-forum.com/forum/viewtopic.php?f=9&t=67242&p=990460&hilit=machine+monkey+exhaust+gwatson#p990460

:)
 
Indeed i have opened them up. Me and Gwatson went in to it as a trial. We agreed on how to do it. Unfortunately he didn't like the way they sounded. I believe they where to raspy. I am glad the new owner likes them though.

Since then i have done another set. With much better results i have heard these in the flesh they sounded a bit deeper. Keeping that M rasp and a bit louder. I believe there is non or very little drone.

But i think unless you want to keep the stock look. After market is the way forward. Mr Wilks has done a thread on his back boxes. They sound really really good.
 
XMetal said:
I can definitely say that the Remus is no where near 40% louder than stock. It's more like 10%. 15% if I'm being generous.
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I disagree - the Remus backboxes are at least 40% louder than stock and return lots of pops and bangs when the system's hot. At 4500rpm / 1m they return between 86 and 89dB, so fall within the limits for most UK track days.

In combination with an aFe intake and VT Competition engine mounts there is a minor resonance in the cabin at 2000rpm, but no drone. This setup often provokes positive comments and is loud enough to turn heads even driven fairly gently in town but it isn't enough to upset my neighbours at 0600h.

XMetal, are you running US or Euro headers? The former likely mute the exhaust considerably.

Here's mine in direct comparison with a Lotus 211. The sound is somewhat rounder now a few years on. The additional sound in the first video is the compressor for the tent:



 
BMWZ4MC said:
XMetal said:
I can definitely say that the Remus is no where near 40% louder than stock. It's more like 10%. 15% if I'm being generous.
Click to expand...
I disagree - the Remus backboxes are at least 40% louder than stock and return lots of pops and bangs when the system's hot. At 4500rpm / 1m they return between 86 and 89dB, so fall within the limits for most UK track days.

In combination with an aFe intake and VT Competition engine mounts there is a minor resonance in the cabin at 2000rpm, but no drone. This setup often provokes positive comments and is loud enough to turn heads even driven fairly gently in town but it isn't enough to upset my neighbours at 0600h.

XMetal, are you running US or Euro headers? The former likely mute the exhaust considerably.

Here's mine in direct comparison with a Lotus 211. The sound is somewhat rounder now a few years on. The additional sound in the first video is the compressor for the tent:



Click to expand...

so are you running the remus system sounds really nice :thumbsup:
 
Video of Stromung and Gruppe M - https://youtu.be/SfN6Xq5TXeo

Stromung is about £640 including shipping and import duty from the states.

Look great too.




 
BMWZ4MC said:
XMetal said:
I can definitely say that the Remus is no where near 40% louder than stock. It's more like 10%. 15% if I'm being generous.
Click to expand...
I disagree - the Remus backboxes are at least 40% louder than stock and return lots of pops and bangs when the system's hot. At 4500rpm / 1m they return between 86 and 89dB, so fall within the limits for most UK track days.

In combination with an aFe intake and VT Competition engine mounts there is a minor resonance in the cabin at 2000rpm, but no drone. This setup often provokes positive comments and is loud enough to turn heads even driven fairly gently in town but it isn't enough to upset my neighbours at 0600h.

XMetal, are you running US or Euro headers? The former likely mute the exhaust considerably.

Here's mine in direct comparison with a Lotus 211. The sound is somewhat rounder now a few years on. The additional sound in the first video is the compressor for the tent:



Click to expand...

Perhaps running US header may be why it's more muted compared to your Euro header. But then again, I'm also comparing US header with stock versus US header with Remus - so it's all relative. I have not heard my car from the outside, but from the driver's seat, the Remus is definitely just barely louder than stock. A lot of my friends don't even know I have an aftermarket back box until I mention it. When cold, it's indistinguishable from stock. Only when it gets hot, then the volume will increase slightly.
 
Just to add my 2p. I had the stromung exhausts on my car and found them too loud for a daily car (inside the cabin)- too much drone and too loud on cold start. I'm running stock at the moment and waiting for a set of 2nd hand Remus boxes to come up
Edit: just as a gauge - just driving in to the multi-storey car park at work would set off at least 1-2 car alarms daily
 
Yeah admittedly it maybe a little too loud for some if the car is being used everyday. But then again, I wouldn't ever fancy commuting in the ///M.
 
gwatson said:
Yeah admittedly it maybe a little too loud for some if the car is being used everyday. But then again, I wouldn't ever fancy commuting in the ///M.
Click to expand...

I think I have shortened my list to SS Race / SS Powerloop or Stromung (which seems really good value). Anyone got an Eisenmann?
 
X-Metal, it may be that the effect of the US headers is to mute any subsequent exhaust system to such an extent that the differences between stock and the Remus boxes is negligible. Otherwise, perhaps the Remus boxes in the US are to a different specification to those in Europe.... The best test would be if you fitted Euro headers! :)
 
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