1M midpipes v N55 midpipes

[Papethova]

Originally Posted by nicoz

It's the same 3'' pipe at the end anyways?! No?!

This

[nicoz]

Originally Posted by Papethova

This

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[Ian///M]

Originally Posted by nicoz

It's the same 3'' pipe at the end anyways?! No?!

I understood that the N55 mid pipes where 2.75", while MadDad's are 3". Not referring to the ends though.

See here: http://www.daddysscp.com/product_p/md135mp.htm

[NC]

Originally Posted by oldBMWguy

I ordered my N55 midpipes from http://getbmwparts.com/. for about $333 plus shipping to Va. Their diagram also showed the cats in the pipes, but they said the diagram was wrong... and they were correct. It came without the cats [I think the price is the giveaway-- if it is in the $330-350 range, you got the correct one].

FYI - I was quoted the following on my order from http://getbmwparts.com/:

Items Total: $333.22
Shipping Method: Standard Ground - US Only
Shipping: $24.95
Handling Fee: $3.95
Order Total: $362.12

Now they are telling me it's $75.00 for shipping even though they provided the quote above. Be warned.

[nicoz]

Originally Posted by ianf

I understood that the N55 mid pipes where 2.75", while MadDad's are 3". Not referring to the ends though.

See here: http://www.daddysscp.com/product_p/md135mp.htm

I'm not sure about the exact sizing though... maybe someone here knows. But I do think the last little bit of piping before connecting to the rear part is 3'' on both midpipes... am I correct? Is the beginning of the rear part 3''? If so, and if both midpipes end in a 3'' pipe, then the restriction to flow will be the rear part anyway... even if midpipes were 4 or 5''.. to say something. Am I still correct?

[Zuzu]

Originally Posted by nicoz

I'm not sure about the exact sizing though... maybe someone here knows. But I do think the last little bit of piping before connecting to the rear part is 3'' on both midpipes... am I correct?

If you are referring to the OEM axle back pipe, before the muffler, then yes it is about 3"..

If you are referring to the midpipes, there is NO 3" pipe on the midpipes themselves.. You sound confused what is the midpipe and what is the axle back section..

[nicoz]

Originally Posted by Zuzu

If you are referring to the OEM axle back pipe, before the muffler, then yes it is about 3"..

If you are referring to the midpipes, there is NO 3" pipe on the midpipes themselves.. You sound confused what is the midpipe and what is the axle back section..

I'm not confused lol

Well, to answer all this, what is the size of the last part of the stock midpipe you took out? 2,75 or 3''? Then we'll know!

Thanks in advance!!

[-Z-]

Originally Posted by ianf

I understood that the N55 mid pipes where 2.75", while MadDad's are 3". Not referring to the ends though.

See here: http://www.daddysscp.com/product_p/md135mp.htm

this...

[Papethova]

Originally Posted by nicoz

?

I forgot the numbers now but the bottleneck would be the 3" pipe at the rear. Dual 2.5s or 2.75s will get restricted at a single 3, obviously dual 3s will too. This is strictly volume measurements.

[nicoz]

Originally Posted by Papethova

I forgot the numbers now but the bottleneck would be the 3" pipe at the rear. Dual 2.5s or 2.75s will get restricted at a single 3, obviously dual 3s will too. This is strictly volume measurements.

That's what I thought!

[Ian///M]

Originally Posted by Papethova

I forgot the numbers now but the bottleneck would be the 3" pipe at the rear. Dual 2.5s or 2.75s will get restricted at a single 3, obviously dual 3s will too. This is strictly volume measurements.

True. MD's have slightly smoother bends, but nothing in it really, more on what sound you want. Now that they have got some miles on them there is even more nice burble on over-run. It is a fair bit louder than stock though especially on start up and in confined areas.

[RPM90]

Originally Posted by NC

FYI - I was quoted the following on my order from http://getbmwparts.com/:

Items Total: $333.22
Shipping Method: Standard Ground - US Only
Shipping: $24.95
Handling Fee: $3.95
Order Total: $362.12

Now they are telling me it's $75.00 for shipping even though they provided the quote above. Be warned.

That's a great price for this setup.

I was thinking that an exhaust shop could easily cut out the secondary cats and weld in a same diameter tube in it's place.
It would probably cost less, but at about $370 it's not bad.

Since this won't throw codes, I'll ask a shop how much to cut and weld.
Can't be too pricey and no need to disconnect what's their, unless of course they can't get to it while the system is in place.

Those that have done this yourselves, does it look like there's room to cut and weld in a couple straight pieces while everything is still bolted up OEM?

[NC]

Originally Posted by RPM90

That's a great price for this setup.

I was thinking that an exhaust shop could easily cut out the secondary cats and weld in a same diameter tube in it's place.
It would probably cost less, but at about $370 it's not bad.

Since this won't throw codes, I'll ask a shop how much to cut and weld.
Can't be too pricey and no need to disconnect what's their, unless of course they can't get to it while the system is in place.

Those that have done this yourselves, does it look like there's room to cut and weld in a couple straight pieces while everything is still bolted up OEM?

I have been emailing back and forth with them and there is a shipping policy that states mid-pipes are a flat rate $75 shipping cost regardless of what they email quoted price states. Apparently there are limitations to the software the ties shipping costs to certain parts. I agree that even with the $75 shipping cost their price is somewhat competitive. My dealer quoted something around $433.

In regards to having a shop cut out the secondary cats on the original pipe I guess you could do that but I'd rather keep the original and buy a new N55 mid-pipe. Best of luck in whichever direction you choose.

[CarJunkie]

Originally Posted by ianf

Zuzu, who has the N55 mids, and I will try do a side by side video soon

I will watch for it . . . having a hard time deciding.

[mm1]

I just did the swap to N55 mids, happy for now, can`t say that the drone is gone completly, now it`s just in a narrower rpm range. Sounds maybe a few % louder, cold start beeing a highlight. Now waiting for a back box, my neighbours aren`t gona be happy.

[mojo_78613]

Sounds like a reasonable mod using an OEM part. I wonder why BMW did not consider using the N55 midpipe when this car was being tested and produced..... Is this an easy DIY or should one have a shop install? I saw a video posted by one of the vendors for someone who installed an N55 midpipe, Akrapovic slip on, and a wireless kit.... This set up sounds really good..... If I were to do this, I would have skipped the wireless kit... I'm also trying to find reviews for Ramus's Street Race which is slightly cheaper than Akrapovic's Slip on.... Any thoughts or pointers would be greatly appreciated... One thing that bothers me with some of the vendors, is they are trying to sell high performance exhaust systems and avoid providing facts that would help sell their item... Sorry for going off topic here... Cheers!

[EINSER M]

Originally Posted by mojo_78613

Sounds like a reasonable mod using an OEM part. I wonder why BMW did not consider using the N55 midpipe when this car was being tested and produced..... Is this an easy DIY or should one have a shop install? I saw a video posted by one of the vendors for someone who installed an N55 midpipe, Akrapovic slip on, and a wireless kit.... This set up sounds really good..... If I were to do this, I would have skipped the wireless kit... I'm also trying to find reviews for Ramus's Street Race which is slightly cheaper than Akrapovic's Slip on.... Any thoughts or pointers would be greatly appreciated... One thing that bothers me with some of the vendors, is they are trying to sell high performance exhaust systems and avoid providing facts that would help sell their item... Sorry for going off topic here... Cheers!

if im not mistaken the N54 pollutes more than the N55 that is why secondary cats are needed in the N54 setup.

[mojo_78613]

Thanks for the reply. I guess it's safe to keep the OEM (N54) midpipe just from an environmental standpoint... Not sure whether people who swapped their midpipes have experienced any odors due to the lack of secondary cats... Cheers!

Originally Posted by EINSER M

if im not mistaken the N54 pollutes more than the N55 that is why secondary cats are needed in the N54 setup.

[EINSER M]

Originally Posted by mojo_78613

Thanks for the reply. I guess it's safe to keep the OEM (N54) midpipe just from an environmental standpoint... Not sure whether people who swapped their midpipes have experienced any odors due to the lack of secondary cats... Cheers!

i put the N55 mids on my 1M and no change as far as that was concerned
i'd get gas smell on a catless downpipes setup for sure though

[pearlwhites]

Anyone here running the N55 midpipes with a set of catless dp's?

[Pete_vB]

Originally Posted by mojo_78613

I wonder why BMW did not consider using the N55 midpipe when this car was being tested and produced.....

The N55 was designed as a less expensive replacement for the N54. The mission was to duplicate the performance while reducing costs. Cats are expensive, so the N55 was engineered to allow the use of a single cat while still making emissions. Twin turbos and forged internals were also dropped for the N55, further reducing cost but reducing the strength and performance potential, which is why the factory chose the N54 as a base for tuning with the 1M.

[Denso]

Originally Posted by Aussie_in_London

Just ordered mine, will fit sometime next week........

Hi Mate,

Have you fitted this now and do you notice any difference ? I am back next weekend and getting mines fitted a week on Monday. Would appreciate your thoughts