3.0SE De-Cat
- Thread starter JDM
- Start date
Check the supersprint exhaust kits http://www.supersprint.com/USP0000bmwZ46.asp .
They offer exhaust manifold without cats, and I'm planning to go for that. Practically you will not get but few HPs but the sound of your engine will be much better and by removing the back pressure caused by cats your engine will be relieved. As you can see the price of 1.134,00 eur is big but I know few guys with those exhaust sistems, and is really worth.
They offer exhaust manifold without cats, and I'm planning to go for that. Practically you will not get but few HPs but the sound of your engine will be much better and by removing the back pressure caused by cats your engine will be relieved. As you can see the price of 1.134,00 eur is big but I know few guys with those exhaust sistems, and is really worth.
Well Its been done. Cats removed and I can state the following:
* Definite increase in noise. Not that much but a definite improvement
* Much more popping and banging on sudden throttle lifts and revving when the car is stationary
* Not much increase in performance although this was expected. If anything id say it revs a little more freely.
* No difference in Fuel economy. Still getting about 27mpg
* I can also confirm that I have no emissions light on the dash either which is a bonus
Ive attached a little vid that ive just taken now. Excuse the poor quality, I blame the iPhone.
http://img214.imageshack.us/img214/5408/img1244.mp4
Cheers
John
* Definite increase in noise. Not that much but a definite improvement
* Much more popping and banging on sudden throttle lifts and revving when the car is stationary
* Not much increase in performance although this was expected. If anything id say it revs a little more freely.
* No difference in Fuel economy. Still getting about 27mpg
* I can also confirm that I have no emissions light on the dash either which is a bonus
Ive attached a little vid that ive just taken now. Excuse the poor quality, I blame the iPhone.
http://img214.imageshack.us/img214/5408/img1244.mp4
Cheers
John
Thanks for the replies guys. I have to say It does sound good.
I was thinking of removing the back box completely and just having a twin stainless section with new exit pipes (style to agree) in place of the box. Do you think this will be rediculously loud, bearing in mind that there is still the pre-cats and resonators in place? I just want a nice sound with some good bangs and pops, nothing that sounds like a sooped up corsa with a Heinz baked bean tin welded to the back
I was thinking of removing the back box completely and just having a twin stainless section with new exit pipes (style to agree) in place of the box. Do you think this will be rediculously loud, bearing in mind that there is still the pre-cats and resonators in place? I just want a nice sound with some good bangs and pops, nothing that sounds like a sooped up corsa with a Heinz baked bean tin welded to the back
mason storm
Active member
Damn I can't get connection to the MP4, must be my bad connection.
Glad to hear you are reasonably happy with it
Glad to hear you are reasonably happy with it
JDM said:Thanks for the replies guys. I have to say It does sound good.
I was thinking of removing the back box completely and just having a twin stainless section with new exit pipes (style to agree) in place of the box. Do you think this will be rediculously loud, bearing in mind that there is still the pre-cats and resonators in place? I just want a nice sound with some good bangs and pops, nothing that sounds like a sooped up corsa with a Heinz baked bean tin welded to the back
Strange - I can't get access to the clip :thumbsdown:
Glad the decats worked.
Removing the rear can will surely just make your ears bleed. People who fit some aftermarket boxes have to change them so nothing will I'm sure be unbearable.
As above, id usually say remove one or the other, but indeed the manifold cats and (tiny) resonators are indeed still there. If you do it, just make sure you have a nice cut to either sleeve or flange it back on if you don't like it!
Aghh want mine done so much!
Aghh want mine done so much!
Ed - my compromise was to fit a pair of the ///M rear boxes. If they can happily cope with a 3.2 revving to 8,000 then no issue with a 3.0 at 6,000 the resonator also went out of necessity.
I also to your point had everything flanged and appropriate hangers, so that at any time I could change to any aftermarket box or internally modded one with ease
JDM - would love to see a couple of shots of how your cat pipes now look and fit
I also to your point had everything flanged and appropriate hangers, so that at any time I could change to any aftermarket box or internally modded one with ease
JDM - would love to see a couple of shots of how your cat pipes now look and fit
Ed - I would ensure that I could easily refit the box or an after market one without any hassle. I'm unsure what to do at the minute and still like the thought of a quad, the more I look at the CJ's, the more I want it . Just don't want to be paying stupid money. I cant help thinking that all these mods Im doing / planning, It would make more sense to save the money and just buy an 'M'.
CJ - I have attached a couple of pics with the cats missing and then with one of the bypass pipes welded in.. Sorry, they are the only ones I managed to take and they don't look anything compared to your pic... That looks fantastic. I want it.. How much did it cost for the quad if you don't mind me asking?
. Just don't want to be paying stupid money. I cant help thinking that all these mods Im doing / planning, It would make more sense to save the money and just buy an 'M'.CJ - I have attached a couple of pics with the cats missing and then with one of the bypass pipes welded in.. Sorry, they are the only ones I managed to take and they don't look anything compared to your pic... That looks fantastic. I want it.. How much did it cost for the quad if you don't mind me asking?
JDM - Neat looking job - thanks for the photos
Price for mine - I'm reluctant to say as you'll only get upset, but £300 for the beautiful stainless steel pipework, brackets, flanges and all. Supplied my own brand new ///M boxes that were £21 win on Ebay Took them 7 hours of 2 guys working but it was a pre agreed fixed price deal.
Ed - sure. I chopped the battery box in half and rebuilt it to take a race battery, while retaining all the crash protection cut off, etc. Bolted a plate in to cover the void. Few other bits and bobs needed sorting, heat shield adding, fume filter removing, and so on.
Came out like this:
Price for mine - I'm reluctant to say as you'll only get upset, but £300 for the beautiful stainless steel pipework, brackets, flanges and all. Supplied my own brand new ///M boxes that were £21 win on Ebay
Took them 7 hours of 2 guys working but it was a pre agreed fixed price deal.Ed - sure. I chopped the battery box in half and rebuilt it to take a race battery, while retaining all the crash protection cut off, etc. Bolted a plate in to cover the void. Few other bits and bobs needed sorting, heat shield adding, fume filter removing, and so on.
Came out like this:
I know this is a bit of a resurrection, but I'd be interested in feed back from the above posted - particularly JDM who did this.
I am in the market for more noise for my E86 3.0si - which at present just doesn't give enough. Occasional pop and bang from exhaust when very hot, but that's it.
I was thinking about removing the secondary cats to add some more noise and keep standard back box, but JDM sounded underwhelmed above when he did this? Also I think new visual inspection for OEM cats at MOT time mean that although emissions test might be okay - the straight welded decat solution might be a non-starter. As such a flanged, and more expensive, system might be needed - but this starts to get more expensive, and I am concerned as to whether the rewards are worth it?
I have also been looking at back box solutions (as I understand this created a lot of back pressure on the Zed). I would ultimately combine this with the flanged decat solution and was thinking Remus or Eisenmann, but then we start to get seriously expensive - also with both, would that be too loud? Does anybody have a view on whether an M back box would have similar effect with flanged decat solution?
Sorry for the resurrection and ramble - but any help would be much appreciated.
Your quietly,
Alex
I am in the market for more noise for my E86 3.0si - which at present just doesn't give enough. Occasional pop and bang from exhaust when very hot, but that's it.
I was thinking about removing the secondary cats to add some more noise and keep standard back box, but JDM sounded underwhelmed above when he did this? Also I think new visual inspection for OEM cats at MOT time mean that although emissions test might be okay - the straight welded decat solution might be a non-starter. As such a flanged, and more expensive, system might be needed - but this starts to get more expensive, and I am concerned as to whether the rewards are worth it?
I have also been looking at back box solutions (as I understand this created a lot of back pressure on the Zed). I would ultimately combine this with the flanged decat solution and was thinking Remus or Eisenmann, but then we start to get seriously expensive - also with both, would that be too loud? Does anybody have a view on whether an M back box would have similar effect with flanged decat solution?
Sorry for the resurrection and ramble - but any help would be much appreciated.
Your quietly,
Alex
MIJ are the guys that built the tube part of my system. Great work.
It's really important that you are clear about exactly what you want, else you'll end up with something too noisy, too quiet, etc.
I know someone else weht there and had the system removed as it didn't meet their needs.
It's really important that you are clear about exactly what you want, else you'll end up with something too noisy, too quiet, etc.
I know someone else weht there and had the system removed as it didn't meet their needs.