[JackMK]

I have a 2023 M340i and recently have been having this weird vibration noise from inside the cabin and a clunk sort of sound when driving for a min or 2, and then it goes away. I'm running JB4 and a valvetronics exhaust. Could I take this into service and not worry about my warranty being voided? Never really took a modded car in for a service at a normal dealership.

[Jnasratyar]

Originally Posted by JackMK

I have a 2023 M340i and recently have been having this weird vibration noise from inside the cabin and a clunk sort of sound when driving for a min or 2, and then it goes away. I'm running JB4 and a valvetronics exhaust. Could I take this into service and not worry about my warranty being voided? Never really took a modded car in for a service at a normal dealership.

Should be fine to take it into the dealership with the exhaust, I’d remove the jb4 though so they don’t flag you.

[JackMK]

Originally Posted by Jnasratyar

Should be fine to take it into the dealership with the exhaust, I’d remove the jb4 though so they don’t flag you.

Won’t they know it was previously plugged into begin with though

[Jnasratyar]

Originally Posted by JackMK

Won’t they know it was previously plugged into begin with though

Only if they plug into the ISTA, but that only happens when there’s coding related issues, but with them not knowing the problem idk how they’re gonna diagnose it without plugging in. Regardless though they won’t just void your warranty if they see you’ve used a jb4.

[JackMK]

Originally Posted by Jnasratyar

Only if they plug into the ISTA, but that only happens when there’s coding related issues, but with them not knowing the problem idk how they’re gonna diagnose it without plugging in. Regardless though they won’t just void your warranty if they see you’ve used a jb4.

we think it might be the exhaust system since the drive side tips are a little loose when you wiggle them. We're gonna go to a local place to have it tightened and see if that fixes it

[MAKH 5]

I just spoke with a BMW advisor recently at a dealership here in NY and he said BMW just denied someone a warranty repair who was having a transmission issue on a 23 m340 that they had been using a jb4 with. $9k repair.

[AM340iMiami]

Originally Posted by MAKH 5

I just spoke with a BMW advisor recently at a dealership here in NY and he said BMW just denied someone a warranty repair who was having a transmission issue on a 23 m340 that they had been using a jb4 with. $9k repair.

Yikes!

[BLK.G20]

Originally Posted by MAKH 5

I just spoke with a BMW advisor recently at a dealership here in NY and he said BMW just denied someone a warranty repair who was having a transmission issue on a 23 m340 that they had been using a jb4 with. $9k repair.

And that is why is it very important to have a good relationship with your dealer and service advisor.

[JackMK]

Originally Posted by MAKH 5

I just spoke with a BMW advisor recently at a dealership here in NY and he said BMW just denied someone a warranty repair who was having a transmission issue on a 23 m340 that they had been using a jb4 with. $9k repair.

Originally Posted by AM340iMiami

Yikes!

Originally Posted by Jnasratyar

Only if they plug into the ISTA, but that only happens when there’s coding related issues, but with them not knowing the problem idk how they’re gonna diagnose it without plugging in. Regardless though they won’t just void your warranty if they see you’ve used a jb4.

It was the exhaust. Went to a place to have it tightened and now it’s back to normal. According to valvetronics, after a while when the system starts to heat up it gets loose and needs to be retightened