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Car is LOUD after AP header and midpipe

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Car is LOUD after AP header and midpipe

 
Old 10-24-2018, 02:14 PM
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Car is LOUD after AP header and midpipe

So I just had a set of AP headers and mid-pipes installed and although I love the new found power, the cold start up is startlingly loud. These headers delete both sets of cats but retain the resonators and catback.

What can I do to quiet the car down while retaining the new found power?

I was thinking perhaps an X-pipe and high flow cats, or perhaps even a quieter cat-back if one exists?

Any ideas?

Thanks in advance!
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Old 10-24-2018, 02:25 PM
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What headers and a decat made it loud no way I donít believe it
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Old 10-24-2018, 03:03 PM
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Yeah, no **** Sherlock

You can put in high-flow primary cats and 4 x-pipes, but it's still going to be loud as ***.

Good luck
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Old 10-24-2018, 03:34 PM
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Originally Posted by CanadianC63 View Post
So I just had a set of AP headers and mid-pipes installed and although I love the new found power, the cold start up is startlingly loud. These headers delete both sets of cats but retain the resonators and catback.

What can I do to quiet the car down while retaining the new found power?

I was thinking perhaps an X-pipe and high flow cats, or perhaps even a quieter cat-back if one exists?

Any ideas?

Thanks in advance!
I feel like this is common knowledge...

Anyways if it's tuned eurocharged might still do the cold start delete.
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Old 10-24-2018, 03:51 PM
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Originally Posted by Adi-Benz View Post
I feel like this is common knowledge...

Anyways if it's tuned eurocharged might still do the cold start delete.
I wasn't aware you could do a cold start delete. Thanks, I'll definitely look into this!
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Old 10-24-2018, 04:31 PM
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I feel like it is common knowledge also and I don't think the cold start delete will help much. I paid eurocharged for the cold start delete but didn't get what I expected as it was poorly explained to me.

It will not delete the rev at all when you start the car, so you will still get the bit roar like you gave the gas pedal a good stab, what it will delete is the higher idle after the rev that settles down a bit after a minute.

So you get the big rev and then it will go right to 600rpm idle - should be called the high idle delete maybe - so will be better but probably not remove the loudest part that you might want to fix.
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Old 10-24-2018, 05:02 PM
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Originally Posted by CanadianC63 View Post
So I just had a set of AP headers and mid-pipes installed and although I love the new found power, the cold start up is startlingly loud. These headers delete both sets of cats but retain the resonators and catback.

What can I do to quiet the car down while retaining the new found power?

I was thinking perhaps an X-pipe and high flow cats, or perhaps even a quieter cat-back if one exists?

Any ideas?

Thanks in advance!
Hell, I got $100 burning a hole in my pocket if you want to sell me that gear when it gets too loud for you
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Old 10-24-2018, 05:14 PM
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it like he stole it.
SAVAGE cold start is one of the BEST ways to start any morning!

An ez way to reduce the cold startup scream is find/make 2 boxes tall enough/wide enough to surround both sets of exhaust tips, and line boxes with sound proofing material.

Last edited by MBNRG; 10-25-2018 at 07:19 AM.
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Old 10-24-2018, 05:33 PM
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Put 300 cell metallic cats in and it will sound perfect.
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Old 10-24-2018, 07:27 PM
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My car had MBH long tubes, 200 cell cats, straight pipe, no resonator, factory mufflers, and it was ridiculously loud on cold start. It was just loud in general and did not sound good except at wide open throttle.

I had a custom X pipe made right after the cats and it quieted down the car in a major way. Still has a loud cold start, but nothing like before.
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Old 10-24-2018, 07:57 PM
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Originally Posted by roadkillrob View Post
I feel like it is common knowledge also and I don't think the cold start delete will help much. I paid eurocharged for the cold start delete but didn't get what I expected as it was poorly explained to me.

It will not delete the rev at all when you start the car, so you will still get the bit roar like you gave the gas pedal a good stab, what it will delete is the higher idle after the rev that settles down a bit after a minute.

So you get the big rev and then it will go right to 600rpm idle - should be called the high idle delete maybe - so will be better but probably not remove the loudest part that you might want to fix.
Doesnít sound like a tuned cold start delete will solve the initial cold start roar. Good info. Thanks
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Old 10-24-2018, 07:59 PM
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Originally Posted by skratch77 View Post
Put 300 cell metallic cats in and it will sound perfect.
I agree. I think the 300 cell Metallic cats as well as an X-pipe will do the trick.

Last edited by CanadianC63; 10-24-2018 at 08:22 PM.
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Old 10-25-2018, 04:31 AM
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X pipes sound like garbage. Do some digging on the forum, there are extensive threads with video clips and many earlier members experimented with things including myself. Check out my old c63 with the custom silencers and balance pipe. Made it sound exactly what I wanted, didn’t lose any power, my cold starts stopped waking up the neighborhood unless I opened her up, but everyone has different taste. Good luck
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Old 10-25-2018, 04:43 AM
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Get a pair of variable exhaust flanges and have them shut when you start the car....should make a very notable difference in the bark. You can then electronically (or manually via a lever in the cabin) open the valves when your engine warms up and engages VTEC.

Gosh I had my headers swapped out back to stock last week. I forgot how good the car sounds stock and how terrible it sounded with headers. I do however miss the power a little.
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Old 10-25-2018, 07:32 AM
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played around and spent an unnecessary amount of money to summarize what the forum already shared:
1. Akrapovic System (Sounds very tame)
2. Remus Cat Back (Almost stock like mikes power pipes and secondary cat delete)
3. Eisenmann Sport Cat Back (This is what i am on now)
4. Weld in two cats to your existing system. I did this with a set of Meisterschaft Axel Back titanium mufflers, and this was by far my favorite setup! Unfortunately i moved and my new neighbors weren't so happy.
5. A buddy of mine did AP Valved exhaust which quietened the exhaust down with flaps closed, but i could not stand the rattles that the valved made. Hence i didn't want to go valved.

*All above options paired with Long Tube Headers.
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Old 10-25-2018, 12:57 PM
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300 cell race cats xpipe in mids. Donít touch middle resonator. Akra axle back. Done. Or you can put your stock mid pipes back on and call it a day.
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Old 10-25-2018, 01:33 PM
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Just sleep in and you won't wake the neighbors.
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Old 10-25-2018, 01:34 PM
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Originally Posted by roadkillrob View Post
I feel like it is common knowledge also and I don't think the cold start delete will help much. I paid eurocharged for the cold start delete but didn't get what I expected as it was poorly explained to me.

It will not delete the rev at all when you start the car, so you will still get the bit roar like you gave the gas pedal a good stab, what it will delete is the higher idle after the rev that settles down a bit after a minute.

So you get the big rev and then it will go right to 600rpm idle - should be called the high idle delete maybe - so will be better but probably not remove the loudest part that you might want to fix.
This is a good description and exactly what mine does on cold start with EC V7.
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Old 10-26-2018, 01:17 AM
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I have the same set up as you and i installed a magnaflow resonator and it quitened it right down. It didnt last long for me though as it took away the amg noise soo back to stock resonator i went
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Old 10-27-2018, 11:40 AM
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Originally Posted by dubgarage View Post
I have the same set up as you and i installed a magnaflow resonator and it quitened it right down. It didnt last long for me though as it took away the amg noise soo back to stock resonator i went
Do you have any videos of what it sounded like with the magnaflow?

Right now Iím leaning towards 300 cell high flow cats. Just not sure where to have them welded in.

Last edited by CanadianC63; 10-27-2018 at 11:43 AM.
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Old 10-27-2018, 11:44 AM
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Originally Posted by hadam3 View Post
played around and spent an unnecessary amount of money to summarize what the forum already shared:
1. Akrapovic System (Sounds very tame)
2. Remus Cat Back (Almost stock like mikes power pipes and secondary cat delete)
3. Eisenmann Sport Cat Back (This is what i am on now)
4. Weld in two cats to your existing system. I did this with a set of Meisterschaft Axel Back titanium mufflers, and this was by far my favorite setup! Unfortunately i moved and my new neighbors weren't so happy.
5. A buddy of mine did AP Valved exhaust which quietened the exhaust down with flaps closed, but i could not stand the rattles that the valved made. Hence i didn't want to go valved.

*All above options paired with Long Tube Headers.
awesome info. Thanks!
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Old 10-28-2018, 04:41 PM
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I have MBH LTH, 200 cell cats, MBH mid section w/ X pipe, resonator, and stock mufflers. My cold start is loud, my idle sounds stock, and the car sounds fantastic throughout the entire RPM range. I have no droning and if you are cruising you can barely hear it. If you go WOT it is L O U D!!! IMO my setup is perfect, quiet when I want it to be, crazy loud when I'm on it.
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Old 10-28-2018, 06:11 PM
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Originally Posted by 503C43 ////AMG View Post
I have MBH LTH, 200 cell cats, MBH mid section w/ X pipe, resonator, and stock mufflers. My cold start is loud, my idle sounds stock, and the car sounds fantastic throughout the entire RPM range. I have no droning and if you are cruising you can barely hear it. If you go WOT it is L O U D!!! IMO my setup is perfect, quiet when I want it to be, crazy loud when I'm on it.
Do you still have the gunshot loud cold start? That is what I am trying to mitigate.

I can can deal with the noise post start up. Itís the gunshot startup that is not appropriate for my neighborhood.

Would you you have a video of a cold start?
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Old 10-28-2018, 06:31 PM
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Do you have a garage? I just start my car with the garage shut and then IMMEDIATELY open the garage. That way that initial BANG is contained inside and then the door is open so I donít kill myself. I also have the car backed in so the sound isnít going out towards the street. No one ever complains about it.
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Old 10-28-2018, 06:55 PM
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Originally Posted by CanadianC63 View Post


Do you still have the gunshot loud cold start? That is what I am trying to mitigate.

I can can deal with the noise post start up. Itís the gunshot startup that is not appropriate for my neighborhood.

Would you you have a video of a cold start?
cold start is still very loud although I'm betting not as loud as yours. I will post a video tomorrow but I bet it won't do it justice.
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