Anyone using a HM Headers Exhaust? or Walkinshaw?

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Originally Posted by macca_779

I think your delusional if you think you can make it sound like the 6.2 Merc.

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Agreed.

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Originally Posted by Huthy77

I was so hesitant about any system, but did the research and spoke to "Walkinshaw", and then HM to clarify what was what, and what the end result would be like! Personally, when I described my "ideal" note, it was "AMG C63 loaded up!"... Nice a quite, but turned heads to hear that sophisticated sound when pulling away... So far, with the mid section I reckon I won't be too far off that when the rears arrive... The system is a direct bolt-up, so at least I can play around with the HM and Stock rear/mids to achive the note (and no drone) that I want...

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Originally Posted by aaron1828

Hey there i think if u after the exhaust sounding most similar to the c63 amg i reckon the walkinshaw is the closest sounding system out there. I have linked two vids for comparison, i think the walkinshaw has a similar bark/crack noise as the stock c63 when reving, unique sound.

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I think you’ll be pushing sh#t up hill.

The 63 has a distinctive mechanical sound that forms part of the exhaust noise.
The 6.2 AMG internals are so far removed from that of a GM engine, the sound won’t ever be replicated by playing around with a mix and match HM exhaust system.

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This thread has deviated somewhat, I never said I wanted it to sound like a C63, just louder than stock, no drone and legal.

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Originally Posted by Doco

louder than stock, no drone and legal.

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Do they offer you a guarantee that the noise level and emissions are legal?

Of cause not, you’re keeping your hi flow cats and pacemaker extractors, you’re illegal before you start.

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Louder than stock and legal aint gonna happen! They only just scrape under the 90dB from factory

This from the Pacemaker website

7) Will headers make my car louder?
The simple answer to this is 'no'. Headers by nature do not increase the Db range by themselves. The main reason for any exhaust system to increase the sound level is found in the choice of mufflers. Car manufacturers choose to use very restrictive but sound efficient reverse flow mufflers. These mufflers are very effective in reducing noise levels but also are very restrictive in flow. Some after market mufflers are very good in producing a high flow rate while still remaining within the law. Other mufflers are just too small in shape or too big in pipe diameter to do the job of effectively quieting the vehicles emissions. All customers wishing to alter their vehicles exhaust system should check with their states regulatory authority and work with reputable exhaust shops. Headers however do deepen the sound of the note of the exhaust. Much like a flute, if the pulse travelling down the barrel is allowed to escape through the first hole a high pitch is audible, however if the same pulse is allowed to complete the journey to the end, a much deeper note is heard. Headers by their design will have longer tubes than a standard manifold, creating a deeper note.

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Originally Posted by mattnsw

Do they offer you a guarantee that the noise level and emissions are legal?

Of cause not, you’re keeping your hi flow cats and pacemaker extractors, you’re illegal before you start.

.

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Originally Posted by Doco

This from the Pacemaker website

7) Will headers make my car louder?
The simple answer to this is 'no'. Headers by nature do not increase the Db range by themselves. The main reason for any exhaust system to increase the sound level is found in the choice of mufflers. Car manufacturers choose to use very restrictive but sound efficient reverse flow mufflers. These mufflers are very effective in reducing noise levels but also are very restrictive in flow. Some after market mufflers are very good in producing a high flow rate while still remaining within the law. Other mufflers are just too small in shape or too big in pipe diameter to do the job of effectively quieting the vehicles emissions. All customers wishing to alter their vehicles exhaust system should check with their states regulatory authority and work with reputable exhaust shops. Headers however do deepen the sound of the note of the exhaust. Much like a flute, if the pulse travelling down the barrel is allowed to escape through the first hole a high pitch is audible, however if the same pulse is allowed to complete the journey to the end, a much deeper note is heard. Headers by their design will have longer tubes than a standard manifold, creating a deeper note.

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There was this one time...at band camp....

Haha... a little long winded?

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Originally Posted by jkgmh

There was this one time...at band camp....

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Originally Posted by Doco

Haha... a little long winded?

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No the post was good, just couldn't resist the flute implication :lmao:

I didnt actually read the whole thing... answered my question in the first sentence.

I've just got off the phone to an RTA approved engineer, and basically, unless your entire system is ADR approved (which it wont be unless stock) then you're a chance of being done.

He said on late model cars, the emmisions are so tight, even an airbox will breach the EPA guidlines as it alters emissions.

The rules and governing bodies here are a mess, I'm more confused now than I was before. Might just throw the stock airbox back on and pull the pacemakers off while I'm at it... anyone want to swap pacies for stockies?

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Originally Posted by jkgmh

No the post was good, just couldn't resist the flute implication :lmao:

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Originally Posted by Doco

This from the Pacemaker website

7) Will headers make my car louder?
The simple answer to this is 'no'. Headers by nature do not increase the Db range by themselves. The main reason for any exhaust system to increase the sound level is found in the choice of mufflers. Car manufacturers choose to use very restrictive but sound efficient reverse flow mufflers. These mufflers are very effective in reducing noise levels but also are very restrictive in flow. Some after market mufflers are very good in producing a high flow rate while still remaining within the law. Other mufflers are just too small in shape or too big in pipe diameter to do the job of effectively quieting the vehicles emissions. All customers wishing to alter their vehicles exhaust system should check with their states regulatory authority and work with reputable exhaust shops. Headers however do deepen the sound of the note of the exhaust. Much like a flute, if the pulse travelling down the barrel is allowed to escape through the first hole a high pitch is audible, however if the same pulse is allowed to complete the journey to the end, a much deeper note is heard. Headers by their design will have longer tubes than a standard manifold, creating a deeper note.

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Is that your guarantee there won’t be an increase in sound from the Pacemakers?
Where the guarantee on emissions?
Now team the pacemakers with the high flow cats.
Like most of us, your exhaust is illegal.


You’re obviously concerned about a whole range of implications in regard to aftermarket modifications.
You’re got a number of threads running at the moment asking questions in regard to legal and illegal mods. This one is just an extension of your mechanic/insurance one.
You’re not telling the forum members anything new and as you’ve been a member since Jan 2005, I would have thought you’d have picked up on the legalities of some aftermarket equipment long before now.
Police and the EPA can get you anytime they wish. The insurance company when you make a claim.
It’s all a risk and a part of modding your car is accepting the cost if caught.
Or don’t do it at all.

Dam it, lets just all purchase a Prius and get from "A" to "B" like every other tool on the road. Is it possible to have any fun any more??? What is it we can do then??? I can go to a legal business and purchase all the go fast goodies I want but once they are on a car you cannot actually drive it..........

Mate, I'm just asking questions to find out where I stand, and those questions apply to everyone on here. Yes, I joined in 2005, but I've only just recently been active because I only recent;ly bought another Holden.

Apologies if you're finding my posts annoying, but this stuff isn't obvious, you can easily be driving around in an illegal vehicle and be none the wiser.

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Originally Posted by mattnsw

Is that your guarantee there won’t be an increase in sound from the Pacemakers?
Where the guarantee on emissions?
Now team the pacemakers with the high flow cats.
Like most of us, your exhaust is illegal.


You’re obviously concerned about a whole range of implications in regard to aftermarket modifications.
You’re got a number of threads running at the moment asking questions in regard to legal and illegal mods. This one is just an extension of your mechanic/insurance one.
You’re not telling the forum members anything new and as you’ve been a member since Jan 2005, I would have thought you’d have picked up on the legalities of some aftermarket equipment long before now.
Police and the EPA can get you anytime they wish. The insurance company when you make a claim.
It’s all a risk and a part of modding your car is accepting the cost if caught.
Or don’t do it at all.

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Originally Posted by sjhugh

Agreed.

I think you’ll be pushing sh#t up hill.

The 63 has a distinctive mechanical sound that forms part of the exhaust noise.
The 6.2 AMG internals are so far removed from that of a GM engine, the sound won’t ever be replicated by playing around with a mix and match HM exhaust system.
.

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Yeah, I know I'll never replicate the AMG, but when you walk into an exhaust/tune shop, and like any good one should, they try and get an understanding of what you are looking for, and what you'll be happy with! Power vs Sound or Both? Mild, or Wild? Towncar or Racecar? Well, I was just upfront, and said "I'd love hear the AMG"... Quite on idle/cruise, noise out the back of the car, and not through it! I'm realistic, but it seems to be a common "language" and sound that everyone knows!

I'd never say I want the "Snappy/Barky" Xforce, or tell them I want a Hyundai Excel with 4" Hotdogs lighting up the tyres at the lights after the first rain shower!

So the AMG dream it is....

Re. not being able to pass emissions etc with exhaust -

Rubbish , it can be done . We've done it using a HM system.

http://www.ls1.com.au/forum/showthre...amp-the-future

Hi Luis,

I read your thread, great to see. I would have contacted you guys if you were in Syd,

I'm taking my ute in tomorrow, removing the pacemakers, removing the cai, removing the outlaw cats and xforce catback. Replacing with current model HSV extractors, euro 4 cats, and HM headers catback, also putting back the stock airbox. I'm hoping, this combination will bring emissions in check and also db levels.

People on here have said, a stock SS or right on the db allowance, which can't be true, as HSV also hae to abide by the same restrictions, and they sound better than a standard SS.

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Originally Posted by APS Luis

Re. not being able to pass emissions etc with exhaust -

Rubbish , it can be done . We've done it using a HM system.

http://www.ls1.com.au/forum/showthre...amp-the-future

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