[SupraCooper]

I got a jb4 before I even got my car on allocation. Emailed burger and it does work for the g42 m240. You can't void a warranty but a warranty claim. Yes bmw can see that you have a jb4 and get flagged but it doesn't void your warranty claim if it's not related to something regarding your ecu like if u throw a rod. So for example if your window motor goes out then that has nothing to do with the ecu being tuned

[giolanzarin]

Anyone know what's the diameter of the exhaust system? I'm trying to get a resonator delete.

[mblaucoupe135]

Originally Posted by giolanzarin

Anyone know what's the diameter of the exhaust system? I'm trying to get a resonator delete.

that's a good question. I'm not sure either but would like to know as well to do something similar.

[Hendo741]

Originally Posted by giolanzarin

Anyone know what's the diameter of the exhaust system? I'm trying to get a resonator delete.

I waa under the car today, and to my surprise there isn't a resonator to delete. I even snaked the exhaust post down pipe to seen if it was just in the pipes, but nothing back to the split.

I wish there was because the car is just too quiet. A catless downpipe would give it some sound, but don't want the CEL.

[JDM_240]

If you flash your ECU, Aka bm3 or jb4, your ecu will be flagged and bmw na can see this by running basic diagnostics. Piggyback chips are the only way to go and you best be sure to not scuff or fully replace the pins when removed and going in for service. Friend of mine uses racechip on his m5 comp for this reason.

I believe there were flashes for the g80 but the update has made that null and void and relocked it.

[Hendo741]

Originally Posted by JDM_240

If you flash your ECU, Aka bm3 or jb4, your ecu will be flagged and bmw na can see this by running basic diagnostics. Piggyback chips are the only way to go and you best be sure to not scuff or fully replace the pins when removed and going in for service. Friend of mine uses racechip on his m5 comp for this reason.

JB4 is a piggyback, not flash tune. Still has a chance at being detected because the tech would see higher than normal boost levels if they were digging through logs.

Originally Posted by JDM_240

I believe there were flashes for the g80 but the update has made that null and void and relocked it.

The only way to flash a G8X (as of today) is to send the ECU to FEMTO in Russia and have it cloned to a tunable ECU. If for some reason you took that ECU for the recall and had it updated it could be unlocked again by bench unlock. Wouldn't recommend taking a car with a cloned ECU in for a recall though

[GT_Juls]

Originally Posted by Hendo741

I waa under the car today, and to my surprise there isn't a resonator to delete. I even snaked the exhaust post down pipe to seen if it was just in the pipes, but nothing back to the split.

I wish there was because the car is just too quiet. A catless downpipe would give it some sound, but don't want the CEL.

I read the downpipe is equipped with particle filters that deadens sound so a catless downpipe would unlock that but I too dont want the CEL lol.

[Hendo741]

Originally Posted by jhan315

I read the downpipe is equipped with particle filters that deadens sound so a catless downpipe would unlock that but I too dont want the CEL lol.

Are you referring to the catalytic converter? Even a catted downpipe will net some volume. It's just not much. May have to wait for an axel back, or could just go for the muffler delete 🤔

[Hendo741]

Originally Posted by jhan315

I read the downpipe is equipped with particle filters that deadens sound so a catless downpipe would unlock that but I too dont want the CEL lol.

Or do you mean the OPF the EU cars have? US car don't have the extra OPF in the exhaust I don't think.

[giolanzarin]

Originally Posted by Hendo741

I waa under the car today, and to my surprise there isn't a resonator to delete. I even snaked the exhaust post down pipe to seen if it was just in the pipes, but nothing back to the split.

I wish there was because the car is just too quiet. A catless downpipe would give it some sound, but don't want the CEL.

I took my car to a muffler shop to get a quote and he mentioned that they were "tucked up in there". Are you sure there's no resonators on the car?

[Hendo741]

Originally Posted by giolanzarin

I took my car to a muffler shop to get a quote and he mentioned that they were "tucked up in there". Are you sure there's no resonators on the car?

Pretty sure they're just trying to take your money. I plan on getting back under the car tomorrow to retighten everything I messed with yesterday and I'll snap some pics if you'd like.

Like i said, I even shoved an endoscope all the way from the DP clamp to the exhaust split. No secondary cats or resonators just chillin in the tubes either.

[Hendo741]

Heres some pics. No resonators as far as i can tell.

[Hendo741]

more:

[Rdurty2]

Def no resonators on the M240

[giolanzarin]

Originally Posted by Hendo741

more:

Damn… so what would be the best mod to do on the car for better sound?

[Hendo741]

Originally Posted by giolanzarin

Damn… so what would be the best mod to do on the car for better sound?

I would say catted DP or an axel back. I lean towards the former because it can also provide performance gains, but some states (emissions) or dealerships (if you take your car for service) may get pissy. Axel back may get you some sound, but should effect little else.

[MisteClueless]

Originally Posted by Hendo741

I waa under the car today, and to my surprise there isn't a resonator to delete. I even snaked the exhaust post down pipe to seen if it was just in the pipes, but nothing back to the split.

I wish there was because the car is just too quiet. A catless downpipe would give it some sound, but don't want the CEL.

Sorry new to modding so sorry if this is wrong but, if you install a catless dp then drop in an 02 spacer wont that alleviate you throwing a CEL?

That was my plan as alot of b58 forums seem to have stated that. Wanted to go catless dp and jb4.

[kuzdu]

Originally Posted by MisteClueless

Sorry new to modding so sorry if this is wrong but, if you install a catless dp then drop in an 02 spacer wont that alleviate you throwing a CEL?

That was my plan as alot of b58 forums seem to have stated that. Wanted to go catless dp and jb4.

spacer sometimes work and doesn't depends on the driving style. if you drive normal the spacer will work if you drive aggressive it will throw a CEL after a few 100 miles. i don't have either and my cel comes on twice a day with the JB4. i just learned to live with it. i even took my car to BMW for service and told them i have a catless downpipe and to ignore the cel, they did all the other work needed and didn't even give me any issues.