Quiet performance exhaust - Do they exist ?

[RobEVo5]

Thanks for all the imput, and would appear that most of us are seeking a more sensible volume exhaust.

I would say the mongoose is a middle of the road box, and just looking at the box size helps to confirm this, but its still too loud for me.

I  have been lucky enough to find a second hand Racing Beat Exhaust, which should be with me soon. So will give it a go and report back here as to my thoughts. If I like it, I will have a mongoose box up for grabs.

Blitz Nur Spec:flamed  sh*t Your neighbours, no take that back your neighbourhood is going to hate you.

[Kash_]

But, if you can avoid your neighbours, the flames are fantastic (even with the bung BTW)  

Have to agree on this, my old exhuast never popped and flamed but the NUR spec does that loads, I guess it shows how good the flow of the Blitz is

[666FLO]

I’ve got a HKS one on mine.. I do worry about annoying the neighbours at silly times of the day  ( Only a little bit though)  Esp when I need to run it a few mins longer for cooling it down and I dont have a turbo timer on it which means i have to sit there and get stared at. To make matters worse, I don\'t have the silencer on it at the moment either as the folk at my work took it off and hid the bloody thing.. :Laugh

[stylus350]

Had a NUR Spec with a silenced center and it was over the top. Went to Custom Chrome in Nuneaton who replaced the backbox for one of their own but kept the unrestricted 3"bore on my strict instructions. 6 db quieter at idle and 5 db quieter at 5000rpm. It still barks a fair bit under WOT but on constant or slight throttle its a lot quiter so you can make discrete entrance and exits and its not boomy on a long run.

Update. Swaped the custom chrome back box onto my recently acquired large street port single turbo rex. It seems these mods make the car harder to keep quiet! It is now as loud as my stock twin car was with the Blitz! Both have silenced mid pipes. Does any one know if the RB box will flow well enough for a TA45 turbo engine? Its all 3" bore at the moment.

[Warthog]

MAX is the only one I know who has sorted the problem with a Feed mid box and Feed back box. To my knowledge the Feed exhaust is the only true performance exhaust.
I run the Feed mid box with a HKS back box, on low boost I can do most tracks but when I open her up on full boost ( at the end of the track day ) I always get a Black Flag for some reason. Well you have to buzz the tower, don\'t you.
 Having said that the 3"-- Feed mid box alone is £350 + vat and I think the back box is about the same, so not cheap.
I will be having a 4" exhaust fitted in Jan 2007 and will sell off my mid box then.

[oldone]

I love this thread,...its all brand names,......:Talking1 ...nobody has actually posted anything tech as to why the one system is louder\\quieter than the next.If you understand the fundamentals of the workings of each of the brand names,surely you could put a system together which suites your needs ??

[Warthog]

Get back under you tree stump and stop shouting at the children.:spank

Oh and where were you yesterday.:flamed

[stylus350]

I love this thread,...its all brand names,......:Talking1 ...nobody has actually posted anything tech as to why the one system is louder\\quieter than the next.If you understand the fundamentals of the workings of each of the brand names,surely you could put a system together which suites your needs ??

Is that an offer of an in depth technical explanation?

[oldone]

Get back under you tree stump and stop shouting at the children.:spank

Oh and where were you yesterday.:flamed

There you go,picking on old people who cant remember,:spank  thanx for that Hog...:o  sorry....off to bed know D\\S !:WaveBye

[dubber91]

There you go,picking on old people who cant remember,:spank  thanx for that Hog...:o  sorry....off to bed know D\\S !:WaveBye

see ya all missed out now guys.....

:2Confused

[RobEVo5]

Banter aside - Duno about a true techy explanation, but you have only got to look at the backboxes from one make to another to see why one could be louder than the next.

A blitz or a Nur spec for example has a cherry bomb for a back box, which you might as well not bother with for its silencing abilities. The cherry bombs only alter the note of the exhaust.

Other makes like my mongoose has a very small silencer in the mid pipe and a decent sizes silencer at the rear, but the path is straight through.

To get a really quiet box you must either need a huge straight through box with good baffles, or a handed entry and exit system. But this would seriously hinder the flow.

Have yet to see the racing beat, but guessing its got a good sized rear box, and due to the expense of them have good baffles inside.

The tailpipe will also makes a difference to the pitch and resonance of the exhaust, my mongoose has a huge single outlet which although quieter than most does give a deep noteult as a res, and drones a little at certain speeds as a result.

The twin Racing beat, will hopefully create some harmonics and create a raspier and higher pitched note.

Over the years and various jap performance cars I have never found any benefit from one free flow zorst to the next especially up to a 400bhp at the fly level. Beyond this I have found you need  a 3" on other cars beyond 400bhp. And not that i have got there yet 500+ probably does deserve a 4" system.
 
At my level of tune I won\'t get too hung up about the performance, more looking for the right noise, the potential of a few BHP loss here of there for a few lf/lb or torque gain here or there really don\'t bother me.

Which is another consideration - A zorst that flows very freely on a lower BHP car will decrease the backpressure and loose torque as a result. I would sooner have torque than BHP anyday. Torque is what you feel when you drive, and thats whats its all about IMHO.

[Initial-D]

Recently put an R-Magic 4" straight through system on my car with a huge Cherry bomb style can and 5" exit. The noise is unbeleivable, be it at idle, 3K revs and on full boost. I have to plug my ears on convoys. The fact I have a large street port probably doesn\'t help matters either lol!

I had a Blitz Nur-Spec on there before which I thought was loud! I would be interested to know what the best high flow silenced mid-pipe is, currently Feed appears to be the best although I know Apexi also does a rather nice one.

[stylus350]

Banter aside - Duno about a true techy explanation, but you have only got to look at the backboxes from one make to another to see why one could be louder than the next.

A blitz or a Nur spec for example has a cherry bomb for a back box, which you might as well not bother with for its silencing abilities. The cherry bombs only alter the note of the exhaust.

Other makes like my mongoose has a very small silencer in the mid pipe and a decent sizes silencer at the rear, but the path is straight through.

To get a really quiet box you must either need a huge straight through box with good baffles, or a handed entry and exit system. But this would seriously hinder the flow.

Have yet to see the racing beat, but guessing its got a good sized rear box, and due to the expense of them have good baffles inside.

The tailpipe will also makes a difference to the pitch and resonance of the exhaust, my mongoose has a huge single outlet which although quieter than most does give a deep noteult as a res, and drones a little at certain speeds as a result.

The twin Racing beat, will hopefully create some harmonics and create a raspier and higher pitched note.

Over the years and various jap performance cars I have never found any benefit from one free flow zorst to the next especially up to a 400bhp at the fly level. Beyond this I have found you need  a 3" on other cars beyond 400bhp. And not that i have got there yet 500+ probably does deserve a 4" system.
 
At my level of tune I won\'t get too hung up about the performance, more looking for the right noise, the potential of a few BHP loss here of there for a few lf/lb or torque gain here or there really don\'t bother me.

Which is another consideration - A zorst that flows very freely on a lower BHP car will decrease the backpressure and loose torque as a result. I would sooner have torque than BHP anyday. Torque is what you feel when you drive, and thats whats its all about IMHO.

I have just ordered a Racing Beat single exit from rotechnics which should be here tomorrow so i too can make a comparison for peeps with large ports and singles. It is 3" all the way through so i am guessing it will still be ok for circa 500hp although that will have to wait for water injection and larger injectors. I am speaking to Kerim about this on Monday.
 
Dont think I can entirely agree with you last statement.

Which is another consideration - A zorst that flows very freely on a lower BHP car will decrease the backpressure and loose torque as a result. I would sooner have torque than BHP anyday. Torque is what you feel when you drive, and thats whats its all about IMHO.

From my experience this is true for normally aspirated engines. On turbo engines the less restriction the better. But I repeat IMO.

[stylus350]

Ok. Fitted the single exit Racing Beat tonight. LOVE IT! It can still be heard but bear in mind this car has large street port. I dont feel like a complete **** driving it now. The excessive noise ruined an otherwise outstanding car for me. I could not be happier!! Its got a great throaty sound and screams on WOT but I would put it in the below average noise bracket now as opposed to loud as f**k.

A big up to Rotechnics who were knowledgable and polite and got it to me before 10am this morning when I ordered it at 12 yesterday.

[NurburgRob]

What did the Racing Beat Silencer cost you? and where are the pictures?

I\'ve thought about getting one of these.  Wanted a Blitz Nur Spec V which is tunable but they don\'t make it for the rex? why??

I think Nur Spec R will be too loud.  So pics then, come on, what\'s taking you so long lol