Can someone tell me if this damage is normal? (MPPSK)

NYG · 05-11-2017, 05:17 PM

I'm getting extremely aggravated with my BMW dealer, their service department is horrific. I've already went back 4 times to get my MPPSK adjusted/fixed/reflashed. Now I suddenly have very loud vibrations under my feet during cold starts so I looked under the car and saw that I have a huge dent in my exhaust. This is the first time I'm "modding" my car in any way so I have no idea whether imperfections in the exhaust is normal or not. It's a brand new car and I've never hit anything underneath it.

NYG · 05-11-2017, 05:19 PM

Another photo

cmplaya · 05-11-2017, 05:30 PM

i think its normal and comes like that? i remember a thread a couple months back and everyone seemed to have same dent

ishowerinjager · 05-11-2017, 06:02 PM

I haven't checked mine but I've read multiple places on the forum where they come like that new

High Flier · 05-11-2017, 07:03 PM

Quote:

Originally Posted by bjcarls

With said aero panels on the lower arms. Car is very smooth underneath.

From the MPPSK Official Release thread, post #247. This one looks slightly different. Maybe for clearance or could be some complex waveguide issue designed to create the right tone? :-) Just guessing. I'll take a close look at mine BEFORE it's installed.

I'm curious, though, what were the symptoms that prompted you to get your MPPSK reflashed? I'm planning to get one very soon, but have some confidence issues with my dealer who seems to know less about the MPPSK than I do.

Beek · 05-11-2017, 07:28 PM

It's normal, in fact you can see it in the kit shown on page one of the MPPSK Thread.

riskmaker76 · 05-11-2017, 08:24 PM

How did you know to get the dealer to reflash it?? What symptoms were you having?

Quote:

Originally Posted by NYG

I'm getting extremely aggravated with my BMW dealer, their service department is horrific. I've already went back 4 times to get my MPPSK adjusted/fixed/reflashed. Now I suddenly have very loud vibrations under my feet during cold starts so I looked under the car and saw that I have a huge dent in my exhaust. This is the first time I'm "modding" my car in any way so I have no idea whether imperfections in the exhaust is normal or not. It's a brand new car and I've never hit anything underneath it.

raqautle · 05-11-2017, 11:16 PM

I don't have the MPPSK, just the stock exhaust, and I noticed this too the other day, but it seems to come like that

ErkanTR16 · 05-12-2017, 12:31 AM

This seems to be normal. I pointed this out to my SA. He brought in a brand new 340i and showed it to me on the lift.

NYG · 05-12-2017, 01:18 PM

To answer the reflash questions, it started off as my dealer basically lying to me and saying that they can't seem to flash my computer and that I'd have to bring it back. The reality was that their master tech went home and no one knew how to do it. So according to my SA "I had a partial flash with only 75% of my extra power." Which was basically a shitty way of saying "the exhaust is installed so you're getting 5 hp from it but the flash didn't happen." I came back and they tuned it a few days later. Sorry for not being as descriptive about it. That being said, I'm still not sure if I've actually got the tune but my VIN appears as B58M for the engine so I'd assume it works.

Mike@N54Tuning.com · 05-12-2017, 01:34 PM

That his so weird for it to be dented like that by choice. doesn't even seem to be the lowest point.. Makes no sense.

Mike

NYG · 05-12-2017, 01:54 PM

Quote:

Originally Posted by Mike@N54Tuning.com

That his so weird for it to be dented like that by choice. doesn't even seem to be the lowest point.. Makes no sense.

Mike

That's where I'm confused.... they're reducing the flow area so maybe they crimp it there to increase exhaust velocity for added sound effects.

riskmaker76 · 05-12-2017, 02:30 PM

Others who have a 340/440 WITHOUT MPPSK stated their VIN also said B58M - I suspect this is NOT a good way to tell.

When you do a WOT pull in 2nd and 3rd what peak HP / TQ numbers you getting?

I get about 360 - 370 HP / 370 for TQ

Quote:

Originally Posted by NYG

To answer the reflash questions, it started off as my dealer basically lying to me and saying that they can't seem to flash my computer and that I'd have to bring it back. The reality was that their master tech went home and no one knew how to do it. So according to my SA "I had a partial flash with only 75% of my extra power." Which was basically a shitty way of saying "the exhaust is installed so you're getting 5 hp from it but the flash didn't happen." I came back and they tuned it a few days later. Sorry for not being as descriptive about it. That being said, I'm still not sure if I've actually got the tune but my VIN appears as B58M for the engine so I'd assume it works.

NYG · 05-12-2017, 03:58 PM

Quote:

Originally Posted by riskmaker76

Others who have a 340/440 WITHOUT MPPSK stated their VIN also said B58M - I suspect this is NOT a good way to tell.

When you do a WOT pull in 2nd and 3rd what peak HP / TQ numbers you getting?

I get about 360 - 370 HP / 370 for TQ

Quote:

Originally Posted by NYG

To answer the reflash questions, it started off as my dealer basically lying to me and saying that they can't seem to flash my computer and that I'd have to bring it back. The reality was that their master tech went home and no one knew how to do it. So according to my SA "I had a partial flash with only 75% of my extra power." Which was basically a shitty way of saying "the exhaust is installed so you're getting 5 hp from it but the flash didn't happen." I came back and they tuned it a few days later. Sorry for not being as descriptive about it. That being said, I'm still not sure if I've actually got the tune but my VIN appears as B58M for the engine so I'd assume it works.

On the sports display? I'll tell you in about two hours.

cmplaya · 05-12-2017, 05:28 PM

Quote:

Originally Posted by NYG

On the sports display? I'll tell you in about two hours.

NYG · 05-12-2017, 05:36 PM

Quote:

Originally Posted by cmplaya

Quote:

Originally Posted by NYG

On the sports display? I'll tell you in about two hours.

~370 hp ~380 ft-lb

We should just meet up and compare since you're nearby haha

mike@x-ph.com · 05-12-2017, 06:47 PM

I find it ironic that if an aftermarket company did the same thing it would be trashed on the forums, but since its a BMW exhaust everyone is fine with it

NYG · 05-12-2017, 07:04 PM

Quote:

Originally Posted by mike@x-ph.com

I find it ironic that if an aftermarket company did the same thing it would be trashed on the forums, but since its a BMW exhaust everyone is fine with it

I'm not necessarily fine with it but the physics behind it could make sense.

There's a bunch of things that happen at this point. Velocity of exhaust increases at this point as well as headloss. This can alter the sound but I'm only a structural engineer and won't speculate on that part of it.

mike@x-ph.com · 05-12-2017, 07:05 PM

Quote:

Originally Posted by NYG

I'm not necessarily fine with it but the physics behind it could make sense.

There's a bunch of things that happen at this point. Velocity of exhaust increases at this point as well as headloss. This can alter the sound but I'm only a structural engineer and won't speculate on that part of it.

More than likely it is for clearance reasons, they could have made a smoother transition but they went with the cheaper route

NYG · 05-12-2017, 07:07 PM

Quote:

Originally Posted by mike@x-ph.com

Quote:

Originally Posted by NYG

I'm not necessarily fine with it but the physics behind it could make sense.

There's a bunch of things that happen at this point. Velocity of exhaust increases at this point as well as headloss. This can alter the sound but I'm only a structural engineer and won't speculate on that part of it.

More than likely it is for clearance reasons, they could have made a smoother transition but they went with the cheaper route

That may also be true but the aerodynamic effects of a smooth bend vs. a rough bend are pretty significant. If only someone from BMW would actually answer these damn questions.

riskmaker76 · 05-12-2017, 07:08 PM

It's the same did a few pulls...

I'm itching to get a jb4

Quote:

Originally Posted by NYG

~370 hp ~380 ft-lb

We should just meet up and compare since you're nearby haha

NYG · 05-12-2017, 07:10 PM

Quote:

Originally Posted by riskmaker76

It's the same did a few pulls...

I'm itching to get a jb4

Quote:

Originally Posted by NYG

~370 hp ~380 ft-lb

We should just meet up and compare since you're nearby haha

I'm about to go find some empty strips of road..

05-11-2017, 05:17 PM	#1
NYG Brigadier General 10727 Rep 3,686 Posts Drives: Audi R8 Join Date: Feb 2017 Location: Brooklyn, NY iTrader: (0)	Can someone tell me if this damage is normal? (MPPSK) I'm getting extremely aggravated with my BMW dealer, their service department is horrific. I've already went back 4 times to get my MPPSK adjusted/fixed/reflashed. Now I suddenly have very loud vibrations under my feet during cold starts so I looked under the car and saw that I have a huge dent in my exhaust. This is the first time I'm "modding" my car in any way so I have no idea whether imperfections in the exhaust is normal or not. It's a brand new car and I've never hit anything underneath it. Attached Images
	Appreciate 0 Tweet Quote

05-11-2017, 05:19 PM	#2
NYG Brigadier General 10727 Rep 3,686 Posts Drives: Audi R8 Join Date: Feb 2017 Location: Brooklyn, NY iTrader: (0)	Another photo Attached Images
	Appreciate 0 Quote

05-11-2017, 05:30 PM	#3
cmplaya Captain 212 Rep 774 Posts Drives: B58 Join Date: Aug 2015 Location: NYC / Instagram: @cmplaya/@nyc340i iTrader: (0)	i think its normal and comes like that? i remember a thread a couple months back and everyone seemed to have same dent
	Appreciate 0 Quote

05-11-2017, 06:02 PM	#4
ishowerinjager Second Lieutenant 111 Rep 216 Posts Drives: 2017 340i M Performance Editio Join Date: Mar 2017 Location: Edmonton iTrader: (0)	I haven't checked mine but I've read multiple places on the forum where they come like that new __________________ 2017 340i M Performance Edition: Fashion Grey, MPPSK, M performance front splitter, rear diffuser, side sills, black grille, CF spoiler, 405M 20s, 8AT, full Marino interior and dash, adaptive suspension
	Appreciate 0 Quote

05-11-2017, 07:28 PM	#6
Beek Major 707 Rep 1,170 Posts Drives: Most folks crazy. Join Date: Dec 2015 Location: The Twin Cities iTrader: (0)	It's normal, in fact you can see it in the kit shown on page one of the MPPSK Thread. __________________ '16 340xi Mineral Grey/Black Leather, MPSS on 18" 398 Orbit Grey wheels, ZF 8HP50, MPPSK+CF Tips, ZTR, ZMP, ZTP, ZCW, ZDA, ZDB, Black Kidney Grilles. '09 Outback for a beater and grocery getter.
	Appreciate 0 Quote

05-11-2017, 11:16 PM	#8
raqautle Private First Class 87 Rep 191 Posts Drives: '17 340i X-Drive M Sport EBII Join Date: May 2014 Location: New York iTrader: (0) Garage List 2017 340i X-Drive [0.00]	I don't have the MPPSK, just the stock exhaust, and I noticed this too the other day, but it seems to come like that
	Appreciate 0 Quote

05-12-2017, 12:31 AM	#9
ErkanTR16 64-bit 598 Rep 814 Posts Drives: 2018 BMW 340i xDrive Join Date: Aug 2015 Location: Maryland iTrader: (0) Garage List 2018 BMW 340i xDrive [0.00]	This seems to be normal. I pointed this out to my SA. He brought in a brand new 340i and showed it to me on the lift.
	Appreciate 0 Quote

05-12-2017, 01:18 PM	#10
NYG Brigadier General 10727 Rep 3,686 Posts Drives: Audi R8 Join Date: Feb 2017 Location: Brooklyn, NY iTrader: (0)	To answer the reflash questions, it started off as my dealer basically lying to me and saying that they can't seem to flash my computer and that I'd have to bring it back. The reality was that their master tech went home and no one knew how to do it. So according to my SA "I had a partial flash with only 75% of my extra power." Which was basically a shitty way of saying "the exhaust is installed so you're getting 5 hp from it but the flash didn't happen." I came back and they tuned it a few days later. Sorry for not being as descriptive about it. That being said, I'm still not sure if I've actually got the tune but my VIN appears as B58M for the engine so I'd assume it works.
	Appreciate 0 Quote

05-12-2017, 01:34 PM	#11
Mike@N54Tuning.com BimmerPost Supporting Vendor 4914 Rep 115,980 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	That his so weird for it to be dented like that by choice. doesn't even seem to be the lowest point.. Makes no sense. Mike
	Appreciate 0 Quote

05-12-2017, 06:47 PM	#17
mike@x-ph.com BimmerPost Supporting Vendor 24183 Rep 190,777 Posts Drives: 07-335/12-328/18-M4/21-M4CP Join Date: Sep 2013 Location: Las Vegas iTrader: (23)	I find it ironic that if an aftermarket company did the same thing it would be trashed on the forums, but since its a BMW exhaust everyone is fine with it __________________ Check out our current sale by clicking on this link! https://x-ph.com/sale/ Phone number 702-494-9435
	Appreciate 0 Quote