M5 Downpipes experts and gurus? How and why?

[soooma]

Originally Posted by boots

Ya killing me! Lol. Cat vrs Catless. Less weight and no cats to deal with. Price diff because there are no cats = less price. Smoother bends means better flow= more power. Lease ends change them back and turn in car. Sell dp afterwards. Power you can actually feel and awesome sound increase. Fun factor 100%. This is a no brainer power increase. Get a tune and don't worry about inspections. Faster car=yes!

Thank you boots
Sorry for delayed reply ,, was swamped at work !!
I will then do it -
Don't care for the power gains but sound is definitely a bonus, because I still feel this beast deserve to breath better fire and exhale fire if you will -

[soooma]

Originally Posted by bigfra

Fuck aye, I bought ss catted downpipes and still get cel. Get non catted wans.

So you get CEL?
What is the soul ton for this ?
I am not the right person for CEL or any engine light -

[soooma]

Originally Posted by boots

Yea seems everyone who bought them got a cel. When you get a tune they will remove that light, remove speed limiter , and add power. Believe me it works :)))))

I see
Warranty issues with tune?
What is the cheapest tune you woukd recommend guys that takes care of light ?
Ant bidy in Atlanta area?
I live in Charlotte and that's the closest real city - to me

[soooma]

Originally Posted by darkz

I haven't seen any car with catless DP run without a CEL yet, unless there is something wrong with the system itself, must need a tuner to remove this, catless also make the car louder, depends on your personal preference, sometimes I regret getting catless on my other cars, gets too loud and the wife hates it....

Gotcha -
Wife already hates it LOL
Can only imagine what she might hate next ? -

[soooma]

Originally Posted by UnfoundLegend

Sooma you have resonator delete right??

First thing I did after getting exhaustmeister was the catless downpipes. Best decision ever.

For me, it wasn't quite loud enough at higher RPM's on the test drive with just the catless downpipes, and I didn't have the exhaustmeister remote on me at the time (stupid I know), so I had the shop remove resonators and they claimed at the time that it would create massive unnecessary drone and almost no sound gain. I just told them to do it anyway and am I glad I did...!

With exhaustmeister it is as loud as you can possibly get without drone. Absolutely no drone with the valves closed. Perfect for the highway not a single sound from the exhaust in higher gears. Oh and I'm in an M6 by the way, in which the drone would probably be more pronounced.

So hurry up and do it before your lease is up! The only thing you'll regret is why you didn't do it earlier (and some mornings the enormous cold start).

Very nice post UnfoundLegend
Thank you sir for the advice
Still on the fence
Need more data before taking the nose dive -

[soooma]

Originally Posted by M6-Coupe

How do you guys deal with CEL? isn't it annoying?
and don't you have any issue when you go to dealer for service?

I believe service is overrated -
LOL
They are just gutsier than you and me, that's all
Life Is Too Short as well as lease probably -

[soooma]

Originally Posted by darkz

I thought thats why the cat is there to catch the smell? I have had my cat removed on my truck for a year now, and the smell is still going strong, almost want to change it back to catted DP.

Seriously you are making me think twice before pulling the trigger -

[soooma]

Originally Posted by URBAN LEGEND

The smell of raw fuel never goes away. You are taking out the cats/their magic and running straight pipes. Been there, done that, never again.

Thank you Urban Legend I appreciate your perspective which is likely mine by now I have been able with your help guys to for an opinion that likely I'm not doing it,
I appreciate the car luxury 70% of the time and the car sportiness 30% of the time as my commute is about 30 minutes x 2 per day and at time 60 minutes x 2 -

[soooma]

Originally Posted by MFIZZLENYC

So far Loving My Noelle Catted downpipes a few more hp and NO smell or SES light

How much?
How much sound improvement you get?
Drones ?

[soooma]

Originally Posted by Autohaus Frankfurt

Yes if you have a drivability issue and your under warranty, the dealership will hassle in regards to the CEL being on.
A few of my clients that went to 3 different dealerships in CA all had to have me reinstall the factory cats before they would do the diagnostic.
And the issue was no emission related.

Thanks for the heads up Autohaus Frankfurt

[boots]

Sooma if you went straight pipe and Catless you will like them. Smell or no smell. Like I said it goes away

[MFIZZLENYC]

Originally Posted by soooma

How much?
How much sound improvement you get?
Drones ?

They Go for $4500 new

car sounds deeper I added the Dinan Mufflers I prefer just a deeper tone not louder

no smell at all no SES light Bring it straight to the dealer for service

your in NY so one of these meets you can hear the car...

No noticeable drone over the stock exhaust but I feel that the Muffler sound system is louder lol

our stock cats are 1000 cell correct me if im wrong and the Noelles are 400 cell... The main Difference is the Cat substrate it doesn't deteriorate like aftermarket cats will hence the SES light on race cats after 1000 miles or so...

[Boostedm514]

Buy the m5 down pipes from undercover they are the best and nicest made on the market and also the lowest priced for the best quality !

And performing imports in Georgia will help you with install

[ed4]

Did installing DP's on the car increase any resonance, vibration or anything that can be felt?

I'm asking because, many years ago, when I threw in Milltek downpipes into my Audi S4, I could feel slight, but constant vibrations.

[allmotor_2000]

DP's work and don't work - here is why:

On otherwise stock car, DP's help reduce back pressure and indirectly change wastegate duty cycle - hence you get power. It also reduces heat which the car senses and you may get some timing advance and what not.

When you can control the wastegates, the DP's don't do much on stock turbos - maybe it helps hold power a little longer. Don't get me wrong, free breathing = more power, but at the 600-700hp level the stock system is very well designed.

[13M5F10]

Originally Posted by allmotor_2000

DP's work and don't work - here is why:

On otherwise stock car, DP's help reduce back pressure and indirectly change wastegate duty cycle - hence you get power. It also reduces heat which the car senses and you may get some timing advance and what not.

When you can control the wastegates, the DP's don't do much on stock turbos - maybe it helps hold power a little longer. Don't get me wrong, free breathing = more power, but at the 600-700hp level the stock system is very well designed.

So in your opinion, would you recommend it? I am having a hard time deciding because there is a nice deal I can jump on this week. Debating if its work the money.

[allmotor_2000]

Originally Posted by 13M5F10

So in your opinion, would you recommend it? I am having a hard time deciding because there is a nice deal I can jump on this week. Debating if its work the money.

Yes - but what gains you get depend on what mods you plan to do. Free-flowing in this case is better!

[Imran@Evolve]

Apart from the performance gains mentioned they also sound great with even just the stock rear exhaust. Together with valve control you get to choose your sound level and it has zero drone.

[mike@x-ph.com]

Originally Posted by 13M5F10

So in your opinion, would you recommend it? I am having a hard time deciding because there is a nice deal I can jump on this week. Debating if its work the money.

I would.
Faster spool, hold power longer and amazing sound