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03/03/2020LAST POST
Vous cherchez un X-pipe après marché avec suppression secondaire de chat et résonateurs pour votre voiture? Que diriez-vous de modder votre échappement OEM! Il y a très peu de différence entre les x-pipes du marché secondaire et le stock! BMW a construit un système d'échappement de très bonne qualité à partir de l'usine et il n'a besoin que de quelques ajustements mineurs pour extraire la puissance supplémentaire. Je cherchais un x-pipe avec 2ème chat delete avec des résonateurs mais je ne comprenais pas comment les manufactures pouvaient justifier ces prix là, elles doivent penser qu'on a $ à brûler ou que la plupart des propriétaires de M3 juste croient le battage médiatique et achètent: cool! ::bow:

La suppression secondaire de chat (Gut les chats d'usine) est très facile et ne m'a pris environ 3 heures au total, y compris l'enlèvement, la modification et la réinstallation. C’est l’une des meilleures améliorations que j’ai apportées à la voiture. Cela rendra le moteur plus réactif et devrait ajouter environ 8-15hp pour 0,00 $ et un peu de votre temps. Si vous n’êtes pas du type DIY, un atelier d’échappement devrait pouvoir le faire pour moins de 150-200 $.

+ La meilleure partie est que le croupier n'aura aucune idée qu'il est modifié, il semble stock:party0030:


Voici donc le processus de faire un boyau secondaire / supprimer:

1. enlever la partie x-pipe de l'échappement de la voiture, vous pouvez laisser l'échappement arrière sip-on sur la voiture
2. vous aurez besoin de marquer le tuyau d'échappement avec 2 ou 3 lignes parallèles sur chaque tuyau parce que vous les utiliserez plus tard lorsque vous réalignez le tube d'échappement pour le soudage. Maintenant, à l'aide d'une roue coupée, coupez le joint de glissement juste derrière la soudure à l'avant des chats secondaires. Soyez prudent et ne coupez que la paroi extérieure du tuyau, pas tout le chemin à travers
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Image hosted on: i1192.photobucket.com
3. Voici à quoi ressemblent les chats secondaires 200cell
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Image hosted on: i1192.photobucket.com
4. Juste pour référence, ce sont les outils que j'ai utilisés
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5. (PUT ON DUST MASK) prenez votre perceuse 1/2 HD et utilisez un foret à spirale auto-alimenté de 3/4" pour éliminer la majorité du catalyseur. Si vous essayez de le battre, il se comprimera en une masse métallique dure qui se logera à l'intérieur du tuyau d'échappement (croyez-moi :)) Retirez la majeure partie du matériau catalyseur et utilisez ensuite le tuyau pour gratter et pousser le matériel gauche. Vous devriez avoir un tas de catalyseur comme celui-ci du premier chat
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et voici à quoi cela devrait ressembler avec le premier chat enlevé / vidé
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6. maintenant faire la même chose pour le prochain et votre pile de catalyseur sur le sol devrait ressembler à ceci
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7. vous aurez besoin de monter une brosse métallique sur un morceau de tuyau et nettoyer l'intérieur du tuyau d'échappement, il n'a pas besoin d'être parfaitement propre juste obtenir la plupart du catalyseur
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Image hosted on: i1192.photobucket.com
8. maintenant que vous avez le boyau complet, vous êtes prêt à remonter
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9. vous devriez maintenant être en mesure de réaligner l'échappement à l'aide des marques d'alignement que vous avez faites au début. J'ai utilisé un petit soudeur MIG pour souder les tuyaux d'échappement ensemble. Vous devrez faire une série de soudures collantes autour du tuyau d'échappement pour ne pas brûler, ou régler votre soudeur au réglage le plus bas, c'est très courant pour les tuyaux d'échappement.
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Image hosted on: i1192.photobucket.com
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10. si vous essayez d'être furtif alors maintenant le temps de nettoyer les soudures
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et c'est ce à quoi il devrait ressembler, une fois qu'il obtient un peu de colorant chaud sur elle le concessionnaire n'aura aucune idée qu'il est modifié!
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En plus de ce que j'ai écrit au début, j'ai fait ce mod pour ne pas avoir à traiter avec un CEL et ensuite une mélodie, et la chance inévitable que le concessionnaire reflash la voiture pendant le service. Je perdrais alors ma mélodie et devrais payer pour qu'elle soit reflaquée à l'ECU, ce n'est tout simplement pas la peine pour moi pour un supplément de 10-15 whp qu'une chanson vous donne. Je vais probablement à temps intestin les principaux chats OEM aussi, je dois juste trouver une bonne solution CEL que le concessionnaire ne trouvera pas. La plupart des gens HP sortent de nos voitures sont de l'enlèvement des chats (20-30 whp) PAS LE TUNE! (10-15 whp). Je conduis ma voiture sur la piste et je veux savoir que si quelque chose ne va pas avec la voiture, le concessionnaire aura moins à se plaindre et aucune raison de dire que j'ai annulé ma garantie.

J'espère que cela aidera certains d'entre vous qui envisagent de faire ce mod....
C'est super... Je vais sauver 1k... Merci...

Une question rapide... Comment avez-vous nettoyé les soudures ? Je veux le faire aussi mais je ne veux pas gâcher...
Great Write up!

Do you notice any increase in power after doing this?
This is incorrect information from my dyno findings. A proper custom tune will yield 15-20whp. And the secondary cats are maybe worth 10hp and some noise. The primaries delete are worth alot more as the design is far more restrictive.
BT M3 wrote
This is incorrect information from my dyno findings. A proper custom tune will yield 15-20whp. And the secondary cats are maybe worth 10hp and some noise. The primaries delete are worth a lot more as the design is far more restrictive.
Your right on and that is what I was saying! I was not stating that the secondary delete alone was going to get you the same hp as no cats+tune or even main cats+tune. What i was saying is that the power that people are getting out of tunes is directly related to the cats....if you left the cats in place and got a reflash you would only pick up 7-12 whp max ( less than just doing a secondary cat delete and rear slip on, which would not cause any issues from a warranty standpoint like a tune could) Remove the main and secondary cats and even without a tune you will pick up 20whp+.....add a tune to the cat removals and you will add an additional 10-15whp! My point is most of the gains people are getting are not from the tune but from the removal of the cats(65% from secondary and main cat delete and 35% from tune). There is not a lot of hidden hp in this engines tunning parameters stock, you have to really start changing things(cams, pulleys, intake, exhaust, TB, headers, etc....) before you are going to see big gains from a tune.
1sikbmr wrote
This is awesome... Going to save me 1k.... Thanks....

Quick question... How exactly did you clean up the welds? I want to do that also but dont want to mess it up...
Look at #10 and you will see me using a right angle die grinder with a 100grit sand paper wheel on the end of it. It is not quite as fast but way cleaner than using a grinder which would leave large grind marks that the dealer could see. If you have a lot of weld to remove, start with a grinder and then finish it up with the sanding disk.
andrew270681 wrote
Great Write up!

Do you notice any increase in power after doing this?
I have not had it dynoed, but probably only 5-8 rwhp. The big diferance was it makes the engine feal more responsive. I also have the Corsa⁄UUC Exhaust on my car and i noticed a lot more gains in top end pull with the secondary cat delete over just the rear slip on.
Very nice DIY, thanks for sharing. How is the sound afterwards? Hopefully not too much increase in loudness (unless you wanted that).
swamp2 wrote
Very nice DIY, thanks for sharing. How is the sound afterwords? Hopefully not too much increase in loudness (unless you wanted that).
Maybe 5% louder than before, no change inside the car. It did add a little more rumble, sounds awesome!
erics02wrx wrote
Maybe 5% louder than before, no change inside the car. It did add a little more rumble, sounds awesome!
Really? Not noticeable in the car? Cool. My aftermarket cat back Vorsteiner set up added some volume and I am really hesitant to make it any louder. The sound quality was really improved for me but I am definitely concerned about doing something that will make long freeway trips and road trips annoying to unbearable.
nice write up. would the process be the same if i wanted to gut the primaries too? would those be harder to gut and would you be able to put it back together as cleanly.
spoonf20c wrote
nice write up. would the process be the same if i wanted to gut the primaries too? would those be harder to gut and would you be able to put it back together as cleanly.
You can make the cut at the same place to do the primaries, but you will get a cel light.
swamp2 wrote
Really? Not noticeable in the car? Cool. My aftermarket cat back Vorsteiner set up added some volume and I am really hesitant to make it any louder. The sound quality was really improved for me but I am definitely concerned about doing something that will make long freeway trips and road trips annoying to unbearable.
I have the UUC / Corsa exhaust and I was afraid of the same thing (being to loud) but it was barely noticeable. Its a little louder from the outside of the car but on the inside its maybe 5% louder, if that. I love it!
spoonf20c wrote
nice write up. would the process be the same if i wanted to gut the primaries too? would those be harder to gut and would you be able to put it back together as cleanly.
Same process and very easy. You will get a CEL just like alpina527 said..... so you will have to get a CEL fix or tune, I guess you could also just drive it with the cel on, it wont hurt anything but would be very annoying.
alpina527 wrote
You can make the cut at the same place to do the primaries, but you will get a cel light.
This was great. I just finished it flawlessly... didn't take any pics but do have a vid... I do feel a really different car now. It is way more responsive than before and the exhaust note is just 10x better.
1sikbmr wrote
This was great. I just finished it flawlessly... didn't take any pics but do have a vid... I do feel a really different car now. It is way more responsive than before and the exhaust note is just 10x better.
Great job, this is one of the best mods I've done also and your right, the sound is awsome......post your vid!
Thread referenced by 1sikbmr in My ///M3 25/12/2010
I finished mine yesterday and im not impressed by the gains or the sound difference. My car is completely has a complete stock exhaust. I noticed a small gain in responsiveness and small rumble after 3500rpms. overall if you can weld at the house then maybe its worth it. I would not pay a shop 200 smackers to do this. I'm not discrediting what the original post says but I was excited as he was until I drove it and the performance described just was not there. Not being negative, just informative.
Thanks for the write-up, it did go well. One alternative we saw would be to do the cut and weld on the other side of the factory weld so you can put the straps over it and it does not have to be perfect, just flat.
MosesEMMMY wrote
I finished mine yesterday and im not impressed by the gains or the sound difference. My car is completely has a complete stock exhaust. I noticed a small gain in responsiveness and small rumble after 3500rpms. overall if you can weld at the house then maybe its worth it. I would not pay a shop 200 smackers to do this. I'm not discrediting what the original post says but I was excited as he was until I drove it and the performance described just was not there. Not being negative, just informative.
Thanks for the write-up, it did go well. One alternative we saw would be to do the cut and weld on the other side of the factory weld so you can put the straps over it and it does not have to be perfect, just flat.
Thanks for the feedback, its interesting to see that everyone has different outcomes. Main differance is that you still have a OEM rear section. I have a Corsa exhaust, the improvement was noticeable for me and the sound improved also.
hey i'm thinking about doing this mod! but.. i have already taken out the resonators.. do you think if i do this mod will i run into a cel issue>? and how is the idle is it any different ? and will u pass inspection ? or emissons ?
alpine92m3 wrote
hey I'm thinking about doing this mod! but.. i have already taken out the resonators.. do you think if i do this mod will i run into a CEL issue>? and how is the idle is it any different ? and will u pass inspection ? or emissions ?
As long as you don't touch the main cats you will have no issues at all. There will be no change in idle, no CEL and it has no effect on passing your inspection. If you get a sniff test as part of your emissions test I believe you will still pass no problem because the secondary cats are only for start-up emissions reduction. WA state does a OBD2 test only, so there is no problems with the mod as its post the o2 sensors.
YUP! See, but watch people will be to lazy to do this and will start whining and crying to find a reason to buy a 2500 dollar setup lol.