Also, same question as above ^^^ regarding the x pipe?

 

I'm wanting to do just the Magnaflow X-pipe to replace my main resonator. Anyone reported droning? Or this is just for cars with muffler deletes?

 

Do a search on YouTube and you’ll find plenty of vids taken while driving with just an X-pipe.
Keep in mind the stock resonator is actually an X-pipe, but it has quite a bit of sound dampening.
From my experience, I’ve only experienced drone in straight piped, or un-muffled exhausts (muffler delete). You shouldn’t have any drone just doing an X-pipe.

 

I keep seeing some of you using the MF 11226 but that one is a 2.5 inlet/outlet when the exhaust is 2.25.. it’s even noted that those of you are also running the 2.25 X pipe... Am I missing something.?Are you guys sure you’re running the 11226? The 11225 is the 2.25 inlet/outlet
Hoping to clarify quickly as my cousin’s exhaust/brake shop is doing the work for me but I’m ordering the mufflers and getting them dropped shipped to his shop.
For some reason the MF mufflers they were going to use if they provided them would’ve been $375 for a pair! As soon as I order the correct mufflers they’ll set up an appointment and get me in. Doing the front res delete, x pipe and MF mufflers on my C300. Aside from a few $1200 kits this is the best sounding combo I’ve heard.
Thanks!

 

Whomever said or told you those aren’t catalytic converters cause they don’t catalyze anything is completely and 100% incorrect. I just took my car to an exhaust and brake shop owned by a family member and sure enough they’re cats. They have the ‘brick’ inside which is a precious metal which converts exhaust gases. Yes, they’ll provide more sound when deleted but they’re not resonators. They are IN FACT catalytic converters and by federal law they cannot be removed. I’m not saying they shouldn’t or it’s bad or wrong to do, but a reputable shop will not do it. A backyard shade tree shop would be your best bet.
And to those that have said they’re not cats, stop giving others false info. If you don’t know something, don’t pass on ‘info’ if you don’t know what you’re talking about. I fell victim to this and I’m sure other have too.
So I just did my x-pipe and MF mufflers and it’s not quite as loud as I wanted but it’s definitely deeper and has a nice tone and there’s no drone.

 

I just had my resonator swapped for an x-pipe and Magnaflow mufflers installed and there’s no drone at all. You can hear the exhaust a tiny bit in the cabin but I just drove 2 hours and there was no drone at all.

 

Hey guys I've been following your threads and there so many options here.
ive done the x-pipe change so far and I'm a bit disappointed about the sound. So I'm currently looking for something more loud.

So basically there's my options.

My current setup is only an X-pipe
What I can do is :
1 Delete the first faux cat whatever you call it. Is there any sensor in these ?

2 Remove mufflers replace them with magna #12226. But is there a significant change ? And what about the drone ?

3 muffler deletes and once again the drone can be a problem

I don't want to throw about 1k in that system.
Thanks for helping me again.
​​

 

Here's my experience, this will be kinda long.

First I had the resonator replaced with an oval dual-in-dual-out Magnaflow muffler and the stock mufflers replaced with straight pipes. This sounded like ****. The drone was horrible and the exhaust had no character; it sounded the same across the entire RPM band.

Next I had the dual-in-dual-out muffler replaced with a Magnaflow x-pipe and round straight-through Magnaflow mufflers installed where the stock ones would be. This returned the character of the exhaust and improved the drone somewhat. It was no longer horrible and much more comfortable in the cabin. But there is still drone at highway speed.

Next I had the secondary catalytic converters removed. These are not "faux converters" because they do assist in converting the gases but they have no sensors. Removing them hardly changed the exhaust note to make it worthwhile. In fact I started noticing odd behavior from the engine at speed occasionally. It's like it was detecting the gas exiting faster making it think something was wrong, like a brief blip in acceleration during shifts, like cutting out.

Next I bought a used set of stock downpipes and was intending on getting a set of stock mufflers to return the exhaust back to stock. The drone wasn't too bad but driving 60 miles each day was starting to wear on me. Instead I bought a Megan exhaust for the car because it was cheaper than even a set of used stock mufflers. Fitment isn't great - that's another story for another time - and the exhaust sounds about the same as paragraph 2 above.

IMPORTANT!!! When having an x-pipe installed make sure you tell the shop to NOT cut off the flanges from the down pipes. If they do this you will not be able to go plug-n-play back to stock mufflers. Have the shop cut off the flanges from the resonator and add them to the x-pipe so that everything is plug-n-play. No sense ruining every component of the exhaust system.

Next I had the Megan mufflers replaced with straight pipes. Drone is a little worse than paragraph 2 above but this is by far my favorite setup. Under acceleration at higher RPM the car screams and sounds anything like expected.

If I were to do it all over again I would have the resonator replaced with an x-pipe and the stock mufflers replaced with straight pipes. Every other setup was disappointing.

 

First off, these are not ‘faux’ cats. They are a secondary catalytic converter. Any reputable shop WILL NOT remove these as it is against federal law.
That being said, no, there are no sensors there, I think that’s what lead some to think they’re not cats, but they are. Also, this is the most common cause for drone as it’s a longer stretch of straight pipe if they’re removed and it’s right under the cabin. You can find a little ‘Mom & Pop’ shop and I’d bet they’d remove em, or do it yourself.



I have the MF 11226... you can do the 12226, the only difference is the size of the inlet and outlet pipe going out to your tips. 11226 is 2.5, 12226 is 2.25”. Neither will cause drone. I personally like the sound but for some it’s not aggressive enough. From your post, it sounds like this may be the case for you, so if you keep your sec. cats you may want to just delete the mufflers. This leads me to the 3rd question....



Yea, you probably will get some level of drone. You can do a J pipe and use the formula to determine what size you’d need, or just live with it. Me, I didn’t buy this car to sound like an 80’s Camaro. I just wanted close to the same sound as my Audi S8, and with what I did I came as close as possible. If my cousin’s shop would’ve deleted the sec cats I think the sound would’ve been spot on, but they are a good shop that does quality work, not half-assed, jerry-rigged setups, plus, I do think the drone would’ve made it not worth it. Right now, with the X-pipe and MF mufflers I have a very happy medium.

To reiterate what Shimee said, you may be happiest with an X-pipe and muffler delete. For me, that’s a little too...’trailer park’ I guess..not the method, but the sound..it sounds cheap (which it is) and something you’d hear from a 16 yr old’s Honda. I don’t know.. Mine has a deeper tone but not loud, and when you rev it you get that rasp at the top-end which I like. But if you weren’t familiar with this car and heard it going down the street, cruising at 45 or so, you wouldn’t know it had anything done to it, and that’s exactly what I was going for. It seems to me the best sounding option was one of the kits mentioned in the first post of this thread. Shimee says the Megan didn’t fit right and that’s too bad cause I liked the sound of it in the post.

 

I had my resonator replaced with a total flow xpipe yesterday and while I’ve had the magnaflow axleback exhausts on my Bmw and flowmaster exhausts on my camaro - for my C300 I’m going for subtle and refined. The x-pipe for my tastes is the perfect amount. Also the car now seems like it’s picked up a few horses - it’s defintely accelerating easier and is a bit snappier. Could be butt dyno but seems quicker to me.

I had it installed closer to front then straight piped to mufflers - what a great mod!!

 

(Sorry for all the spelling errors &#128514

 

I'd suggest visiting YouTube and listening to some samples. I did this morning and it sealed my mind that I am NOT installing the X-pipe. It sounds like ***. The C300 is nothing special, but I am not about to make mine sound like some kids Civic.

 

I can most assuredly say that it hasn’t. It’s either a placebo effect or the more aggressive sound has you driving more aggressively, but in no way did it pick up any HP at all by just doing the X-pipe.
What you actually did was replace and x-pipe with an x-pipe. Your stock resonator IS an x-pipe, it’s just highly insulated and muffled, that’s why removing and putting one on bare adds tone. But not a 1/10 HP was gained. Still, what’s important is that you seem to enjoy your car more, and that’s the point of all of this.

 

I’ve read the many posts stating it doesn’t add hp but there’s been a couple that think it has. I’m well aware of the placebo effect you are pointing out with the new driving habits and that of course very well may be the case. However - the size of the xpipe was about 1/4 the size and weight of the resonator - and the rest as you know is straight pipe now. Since it is a dual exhaust v6 system it is possible more back pressure was added by this little performance xpipe. Of course without a before and after dyno we’ll never know. And yes as you’ve said it’s more enjoyable and that’s what counts.

 

when you do - make sure to use headphones - the subtle lower register growl does not come across on laptop or cell phone speakers but will on headphones. For the c300 sport I think this is how it should have sounded from the factory personally - to each their own and alll that, though.

 

Well my C300 the way it is now kinda sounds like *** too! Even a lot of SUVs these days have a more sporty sound

 

Stock is assy’r sounding imho. Loving the sound of mine now though!

 

Use headphones or actual speakers - won’t sound accurate on laptop speakers.

my exhaust with X pipe

 

Sorry should've said my c300 is currently stock and sounds like ***

​​​​​​Is yours a C250?

 

c300

 

Im kind of new to the whole modded car scenes so excuse me if i sound stupid. What is the diameter of the straight pipes you would replace the deleted secondary cats and deleted mufflers with?

 

W204 coupe cat back!? I have a 2013 c350 coupe and was looking for any way to upgrade my exhaust.. Is there any direct bolt on aftermarket exhaust for the coupe??

 

hey everyone im new to modding my car and im interested in doing a magnaflow xpipe install after deleting my resonator since a lot of people say it adds some sound. im not looking for it to be obnoxiously loud but enough to my liking. then ill decide if i want to do anything else, most likely muffler delete and installing magnaflow mufflers.

2011 c300 4matic

i dont know the diameter of my pipes i tried to estimate but its so close between 2.5” and 2.25” i dont have a tool for that. if anyone knows that’d be awesome.

also when the resonator is removed the xpipe seems to fit smaller into the space left;
do you place the xpipe dead center of the space with pipes of the same length to make up for the missing space?
orrrr
do you place the xpipe closer to the mufflers or further, and why would that be? any difference?

i have some notes from doing research and looking at videos but not every video has the best sound to compare with others, technology smh. id still like to see some input on what anyone has to say
so excited to try something new!

 

Stock internal diameter is 2.25", external diameter is about 2 ⅜".

The crossover inside the stock resonator is approximately in the middle. It's about where the hole is in this pic: https://cimg4.ibsrv.net/gimg/www.mbw...5e459fcecb.jpg. If that's where it's placed it'll position the x-pipe towards the rear.

Ideally you want the center of the crossover of the x-pipe to be where the crossover of the stock resonator was. The resonator is like a muffled x-pipe. I don't know if this will affect sound or performance (probably not) but the MB engineers put the crossover there for a reason.

Please also heed the bolded advice in my previous post above.

 

thanks for the details about where to position the x-pipe.
internal diameter is 2.25 and external is 2.5, so are they the same? or is there a one thats internal of 2.25 and another that is 2.5? i want my pipes to be the same as the part i order.
seems like a lot of people order the part #10790 https://www.magnaflow.com/products/1...eel-tru-x-pipe
but some still ordered the #10791 which is the 2.5" diameter, do different years of the car have different stock pipe diameters? mine is 2011

ill heed your bolded advice, seems like i can always go back to stock