[jmorgan911]

Can anyone explain the difference between removing the resonator and replacing it with a Xpipe vs removing the secondary cats and putting in bypass pipes?

Sound difference? Power difference? Cost difference?

[onfireX5]

Originally Posted by jmorgan911

Can anyone explain the difference between removing the resonator and replacing it with a Xpipe vs removing the secondary cats and putting in bypass pipes?

Sound difference? Power difference? Cost difference?

Tough question. Best guess is removing the resonator and going to an x pipe will have the best sound improvement. HP gain will be zero. That should be cheaper than removing the secondary cats because access is a beeeooootch. You'll gain some power by removing the secondary cats, but it will be less than you think since the primaries are still there.

[johnm550]

Originally Posted by onfireX5

Tough question. Best guess is removing the resonator and going to an x pipe will have the best sound improvement. HP gain will be zero. That should be cheaper than removing the secondary cats because access is a beeeooootch. You'll gain some power by removing the secondary cats, but it will be less than you think since the primaries are still there.

I'm having an x-pipe made on Thursday. I'll keep everyone posted.

[Demon Barber]

I'm still very interested in doing a custom X-pipe as well, just to see how much difference it would make. Please do keep us updated.

[rygre]

I like my xpipe and 2ndary deletes

[johnm550]

Originally Posted by johnm550

I'm having an x-pipe made on Thursday. I'll keep everyone posted.

Unable to load a video. Sounds good, much louder when reviving, more cracks. Still quiet enough when normal driving. No WOT still in break in, expect it to be much louder under WOT. Looking for carbon fiber tips and better microphone to record. iPhone cuts out because too loud.

[jmorgan911]

Originally Posted by johnm550

Unable to load a video. Sounds good, much louder when reviving, more cracks. Still quiet enough when normal driving. No WOT still in break in, expect it to be much louder under WOT. Looking for carbon fiber tips and better microphone to record. iPhone cuts out because too loud.

Did you try uploading to youtube and linking here?

[jmorgan911]

Another question:

Whats the difference between an X pipe and H pipe? A local shop said he can make an H pipe, I'm guessing that means he doesn't have a Mandel bender and will use two straight pipes with a pipe connecting the two. Wish some aftermarket company just made a good X pipe

[johnm550]

Originally Posted by jmorgan911

Did you try uploading to youtube and linking here?

It sounds so much better in person!!!

[johnm550]

Originally Posted by Demon Barber

I'm still very interested in doing a custom X-pipe as well, just to see how much difference it would make. Please do keep us updated.

After driving it for a few days under normal driving conditions with valves open it is too quiet for me. May need to do secondary cat delete. Definitely a nice improvement and significantly louder when revving. For $300 - $500 it's a no brainer. Definitely needs new exhaust tips.

[RedBullM5]

Originally Posted by johnm550

After driving it for a few days under normal driving conditions with valves open it is too quiet for me. May need to do secondary cat delete. Definitely a nice improvement and significantly louder when revving. For $300 - $500 it's a no brainer. Definitely needs new exhaust tips.

I know this is an old thread, just curious if you ever went ahead and also removed the secondary cats? If so was it a noticeable difference?

[GTATX]

Originally Posted by RedBullM5

I know this is an old thread, just curious if you ever went ahead and also removed the secondary cats? If so was it a noticeable difference?

I just did resonator delete with straight pipes. Love the sound but would love to hear 2nd cats deleted as well.

[GTATX]

My next game plan.

Delete the middle muffler section as it is hollow per another post and instead on doing a straight pipe to join both muffler cap it where the pipe will be cut kinda like Remus and let's see how it sounds. Hopefully will get it done this week. Also getting a narrow x pipe as 90% of exhaust for f90 are x. Will try n see how that goes with this set up. I had a magnaflo pipe but that was huge in the middle kinda like a box and I didn't like the sounds it was too mellow. If anyone want to buy a magna flo X let me know. Thx

[zdbmw]

Any progress?

[GTATX]

Originally Posted by zdbmw

Any progress?

I don't know if u were asking OP or me but my progress is this for now.

Removed the center balance pipe connecting the 2 mufflers and capped the muffler hole. Car sounded more aggressive and meaner.

But as usual it wasn't enough and after watching the dinan X pipe the game plan has somewhat changed.

Ordered today:

Dinan X Pipe
EVO RWs Secondary Cats

Probably will keep the current muffler setup unless end up making a deal on used AWE track exhaust posted for sale currently. If the deal happens great if it doesn't then will be happy with above plan regardless.

[GranitM5]

Originally Posted by GTATX

I don't know if u were asking OP or me but my progress is this for now.

Removed the center balance pipe connecting the 2 mufflers and capped the muffler hole. Car sounded more aggressive and meaner.

But as usual it wasn't enough and after watching the dinan X pipe the game plan has somewhat changed.

Ordered today:

Dinan X Pipe
EVO RWs Secondary Cats

Probably will keep the current muffler setup unless end up making a deal on used AWE track exhaust posted for sale currently. If the deal happens great if it doesn't then will be happy with above plan regardless.

Try this out first. See how you like it and if there is any drone. If you feel it's not enough then get the exhaust.

On my old C63, I removed the resonator first and replaced with a straight pipe. Wasn't enough so I removed the secondary cats and replaced with straight pipe. Still wasn't enough so I went with Catless Long Tube Headers. Then it was finally enough lol. Only thing left to do was removed muffler but that would have caused drone on that car.

[GTATX]

Originally Posted by GranitM5

Try this out first. See how you like it and if there is any drone. If you feel it's not enough then get the exhaust.

On my old C63, I removed the resonator first and replaced with a straight pipe. Wasn't enough so I removed the secondary cats and replaced with straight pipe. Still wasn't enough so I went with Catless Long Tube Headers. Then it was finally enough lol. Only thing left to do was removed muffler but that would have caused drone on that car.

I'm glad I'm not the only one with these planned mods lol. The petrol head is embedded in a lot us lol and the car project is always evolving.

[zdbmw]

I was asking you hahah

After my break in service I'm planning to either remove the resonator and replace it with an x-pipe, or go full catless and keep the resonator.

I've also been thinking about getting a "proper" exhaust system like Eisenmann race, akrapovic, Fi... but I never heard them in person, so I'm really not sure wether a 3000$ exhaust will sound drastically better than a stock exhaust with downpipes and x-pipe..

My goal is to bring out that deep V8 rumble, so if anybody has suggestions or tips for me I'm all ears

[GTATX]

Originally Posted by zdbmw

I was asking you hahah

After my break in service I'm planning to either remove the resonator and replace it with an x-pipe, or go full catless and keep the resonator.

I've also been thinking about getting a "proper" exhaust system like Eisenmann race, akrapovic, Fi... but I never heard them in person, so I'm really not sure wether a 3000$ exhaust will sound drastically better than a stock exhaust with downpipes and x-pipe..

My goal is to bring out that deep V8 rumble, so if anybody has suggestions or tips for me I'm all ears

Just do these 3 things n guaranty you that u won't be disappointed.

Replace Mid pipe with straight pipes

Go cat-less secondary

delete the center pipe with balance tube in between muffler and cap the mufflers. There shouldn't be anything connecting both mufflers to each other.
(similar to Remus)

Cheapest way to go and sound is not any less than an expensive exhaust system.

[BMWDriverX]

I am running secondary ER lowers, Dinan resonator delete, and a GThaus SGT rear section with valve control.

Link to videos of cold start and revs with and without pops/bangs, valves open throughout the video.

https://www.youtube.com/channel/UCEC...cUyJGabS76IMdQ

[GTATX]

Originally Posted by zdbmw

I was asking you hahah

After my break in service I'm planning to either remove the resonator and replace it with an x-pipe, or go full catless and keep the resonator.

I've also been thinking about getting a "proper" exhaust system like Eisenmann race, akrapovic, Fi... but I never heard them in person, so I'm really not sure wether a 3000$ exhaust will sound drastically better than a stock exhaust with downpipes and x-pipe..

My goal is to bring out that deep V8 rumble, so if anybody has suggestions or tips for me I'm all ears

ER secondaries won't clamp to primary. Tried hours still no use. Requested the company to do refund and return. Will figure some new route tomorrow.

[BMWDriverX]

Originally Posted by GTATX

ER secondaries won't clamp to primary. Tried hours still no use. Requested the company to do refund and return. Will figure some new route tomorrow.

Gintani had a similar issue installing my ER secondary's, they had to loosen up the primaries and then they managed to get them to fit after 8 hours. Then there was an issue with the ER pipes mating to the exhaust pipes they were a little too long and went past the flange on the stock pipes causing a small leak. I had to go to a different muffler shop to push the exhaust out towards the back of the car an 1/8" or so and clamp the secondaries down and finally they fit without leaking. ER is a crap company as i brought all this up to them and they told me they would call me back with a solution but never did. I figured i was the only one that had an issue as others have installed without issues but now you're the second one. I personally will never buy anything from ER again but in the end these pipes will fit you just have to install from the top down removing the stock primaries first.