E39 M5 Milltek Exhaust

[Neil.D]

Brothers of M,

Can you post up any Milltek Vids that you may have?

I'm really tempted to get one but am concearned about the cold start volume. I am one of these that doesnt want to wake the neighbours kids everytime I leave in the morning. I do like the quiter volume the M5 has being discreet but it is strangled as we know. Im torn between a backbox and big brake kit and cant decide!
How are they when cold and at idle? Last year whilst on a euro tour, my mates in their GT3 and Impreza were letting rip in every tunnel and I was left sounding rather puny!

How are they on the motorway? Any droning?

Any information appreciated,

Neil.D

[lee182]

I've got a Hayward & Scott on the back of my E39 M5 (which sounds amazing, better than my mates milltek system he had on his M5). Noise is a little loud in the morning (all decent exhaust systems are), but not intrusive on the normal roads or down the motorway.
Stoptech BBK's are the way forward for the M cars, many friends with them all M3's (CSL included) and M5's. Personally I'd get the BBK kit first as the standard setup is not ideal, and this is highlighted even more once new said system is fitted. Then get a back box for £500 from H&S.

[belleair302]

The brake kit is of more use than the exhaust / backbox. Eisenmann are the best people regarding exhausts, unless you want something totally mad made from inconel.

For a decent M5 brake kit either look at AP fitted via Thorney Motorsport for around £2200, or evolve (Luton based) who will do a similar kit for less.

Stoptec brakes are OK but have a close look at Mov'it who manufacture brakes for serious performance cars and Nurburgring addicts and have some amazing calipers and disks for E39's.

[968CSReading]

Sod the neighbours...my RX8 has a loud exhaust and the car idles upto 3000rpm when cold and never wakes my daughther whos room is just above.

Go for it I say.

[CRACKIE]

Neil.D said:

I am one of these that doesnt want to wake the neighbours kids everytime I leave in the morning.

Think positive Neil ~ You'll be doing them a favour by making sure they don't sleep in & miss out on their schooling
This link might give you some ideas. Go for it imho.

http://www.youtube.com/watch?v=60or5awQQsM&fea...

Edited by CRACKIE on Friday 6th February 10:52

[rev-erend]

lee182 said:

I've got a Hayward & Scott on the back of my E39 M5 (which sounds amazing, better than my mates milltek system he had on his M5). Noise is a little loud in the morning (all decent exhaust systems are), but not intrusive on the normal roads or down the motorway.
Stoptech BBK's are the way forward for the M cars, many friends with them all M3's (CSL included) and M5's. Personally I'd get the BBK kit first as the standard setup is not ideal, and this is highlighted even more once new said system is fitted. Then get a back box for £500 from H&S.

http://www.youtube.com/watch?v=7G_Idr4C84c

[E38]

Ive been looking at exhaust options, but I want the best of both worlds, a quiet motorway cruise and a racecar un-silenced roar on demand. A bit of research (m5board) I came across exhaust cut-outs. with a UK supplier here. Will cost about £500, and give you a demonic roar just a flick of a switch away.

They seem quite popular with the Corvette lot, but I am concerned over what will happen to the gas when the valve is closed and there is a dead-end section in the system. Will this raise the back-pressure due to the turbulent flow this may cause? And should this really be done on such an advanced engine?

[lee182]

Stoptechs are more than OK, they were originally designed for the E39 M5. The AP are far to expensive for normal fast road/ occasional track use. And the Eissmenn is a nice sounding system, but if price is no object to you go down the Tubi route for a really nice sound.

[mabjagm3]

Mine has the hayward scott back boxes fitted and all I can say is it sounds awesome with no drone and without being intrusive.

I've never driven around so much with the sun roof open.

Edited by mabjagm3 on Friday 6th February 20:10

Edited by mabjagm3 on Friday 6th February 20:11

Edited by mabjagm3 on Friday 6th February 20:12

[E38]

E38 said:

Ive been looking at exhaust options, but I want the best of both worlds, a quiet motorway cruise and a racecar un-silenced roar on demand. A bit of research (m5board) I came across exhaust cut-outs. with a UK supplier here. Will cost about £500, and give you a demonic roar just a flick of a switch away.

They seem quite popular with the Corvette lot, but I am concerned over what will happen to the gas when the valve is closed and there is a dead-end section in the system. Will this raise the back-pressure due to the turbulent flow this may cause? And should this really be done on such an advanced engine?

Just so people get an idea of the results of an exhaust bypass, have a listen...

http://www.youtube.com/watch?v=pINhSkCv6UU
http://www.youtube.com/watch?v=FuQFRXhv3Mo

And here is an example of the transition between mad and quiet
http://www.youtube.com/watch?v=XmockG6JjdU

[Neil.D]

Thanks for the advice so far guys. I couldnt get a H+S, they are just too loud for me. Milltek strikes a good balance between noise and just noisy.

[Hedgetrimmer]

E38 said:

E38 said:

Ive been looking at exhaust options, but I want the best of both worlds, a quiet motorway cruise and a racecar un-silenced roar on demand. A bit of research (m5board) I came across exhaust cut-outs. with a UK supplier here. Will cost about £500, and give you a demonic roar just a flick of a switch away.

They seem quite popular with the Corvette lot, but I am concerned over what will happen to the gas when the valve is closed and there is a dead-end section in the system. Will this raise the back-pressure due to the turbulent flow this may cause? And should this really be done on such an advanced engine?

Just so people get an idea of the results of an exhaust bypass, have a listen...

http://www.youtube.com/watch?v=pINhSkCv6UU
http://www.youtube.com/watch?v=FuQFRXhv3Mo

And here is an example of the transition between mad and quiet
http://www.youtube.com/watch?v=XmockG6JjdU

I wonder how the open exhaust effects airflow through the system and whether it has a detrimental impact on power. It looks like the system works by generating a branch off the main bore. The branch is blocked at the end rather than at the bore and therefore air can flow down the branch even when closed which will cause tubulance in the main bore. I addition, it would seem that not all the air makes it through the valve when open.

Personally it doesn't have the same sound as a straight through system. It just sounds like the exhaust is broken! H&S is still the better option.

[E38]

Hedgetrimmer said:

E38 said:

E38 said:

Ive been looking at exhaust options, but I want the best of both worlds, a quiet motorway cruise and a racecar un-silenced roar on demand. A bit of research (m5board) I came across exhaust cut-outs. with a UK supplier here. Will cost about £500, and give you a demonic roar just a flick of a switch away.

They seem quite popular with the Corvette lot, but I am concerned over what will happen to the gas when the valve is closed and there is a dead-end section in the system. Will this raise the back-pressure due to the turbulent flow this may cause? And should this really be done on such an advanced engine?

Just so people get an idea of the results of an exhaust bypass, have a listen...

http://www.youtube.com/watch?v=pINhSkCv6UU
http://www.youtube.com/watch?v=FuQFRXhv3Mo

And here is an example of the transition between mad and quiet
http://www.youtube.com/watch?v=XmockG6JjdU

I wonder how the open exhaust effects airflow through the system and whether it has a detrimental impact on power. It looks like the system works by generating a branch off the main bore. The branch is blocked at the end rather than at the bore and therefore air can flow down the branch even when closed which will cause tubulance in the main bore. I addition, it would seem that not all the air makes it through the valve when open.

Personally it doesn't have the same sound as a straight through system. It just sounds like the exhaust is broken! H&S is still the better option.

Well this the same system that Ferraris use (why do you think they are so loud at high revs) except their bypass is designed and integrated much better and the 'valve' is actually part of the main bore.

And IMO the sound from cut-outs is no different to straight pipes. And also if by broken you mean sounding like an example of Americas finest '69 vintage, whilst being quiet and refined after a flick of a switch then 'broken' seems perfect to me. But the fluid dynamics are my concern....

[Hedgetrimmer]

E38 said:

Hedgetrimmer said:

E38 said:

E38 said:

Ive been looking at exhaust options, but I want the best of both worlds, a quiet motorway cruise and a racecar un-silenced roar on demand. A bit of research (m5board) I came across exhaust cut-outs. with a UK supplier here. Will cost about £500, and give you a demonic roar just a flick of a switch away.

They seem quite popular with the Corvette lot, but I am concerned over what will happen to the gas when the valve is closed and there is a dead-end section in the system. Will this raise the back-pressure due to the turbulent flow this may cause? And should this really be done on such an advanced engine?

Just so people get an idea of the results of an exhaust bypass, have a listen...

http://www.youtube.com/watch?v=pINhSkCv6UU
http://www.youtube.com/watch?v=FuQFRXhv3Mo

And here is an example of the transition between mad and quiet
http://www.youtube.com/watch?v=XmockG6JjdU

I wonder how the open exhaust effects airflow through the system and whether it has a detrimental impact on power. It looks like the system works by generating a branch off the main bore. The branch is blocked at the end rather than at the bore and therefore air can flow down the branch even when closed which will cause tubulance in the main bore. I addition, it would seem that not all the air makes it through the valve when open.

Personally it doesn't have the same sound as a straight through system. It just sounds like the exhaust is broken! H&S is still the better option.

Well this the same system that Ferraris use (why do you think they are so loud at high revs) except their bypass is designed and integrated much better and the 'valve' is actually part of the main bore.

And IMO the sound from cut-outs is no different to straight pipes. And also if by broken you mean sounding like an example of Americas finest '69 vintage, whilst being quiet and refined after a flick of a switch then 'broken' seems perfect to me. But the fluid dynamics are my concern....

Just read m original quote and perhaps it was a little blunt. Porsche and Ferrari run similar systems but as you say, they are better engineered, being part of the exhaust itself. My understanding is that the gases still flow through the full exhaust system and that the sound comes through re routing via a valve that sends the gases through a less restrictive side of the back boxes.

On E39 M5 is it necessary to run one on each side of the exhaust?

[puntograle]

Hi Neil - I believe we met at one of the Virginia Waters meets...

I have a tubi on mine and in terms of the decision between brakes and exhaust, I think it comes down to what you will use the car for most. The brakes are really only going to be useful for track days - how many do you intend to do a year?

The exhaust on the other hand, you will enjoy every time you take the car out. I had mine installed just under a year ago and I believe I have hardly turned on the radio since! The noise is totally addictive.

The item to bear in mind though is that my fuel consumption has gone up as I am keeping the car at higher revs when driving than I used to with the stock exhaust.

However, for overall enjoyment of the car, if you will not do many track days then the exhaust will make you smile EVERY time you drive the car..

...all IMHO

[MFiver]

Does anyone have an AC/Hartge/Racing Dynamics/Hamann exhaust for their E39, whats the best?. Even better does anyone have one for sale??? Looking for something special as a treat for my baby