Author Topic: Lets have a muffler thread  (Read 15450 times)

July 08, 2010, 03:44:19 am

Smokey Eddy

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Lets have a muffler thread
« on: July 08, 2010, 03:44:19 am »
pros vs. cons to muffling the sound of your beast. Specifically a homemade straight exhaust.
mine currently is a 2.5 inch turbo back to rear tires split out each side. Very loud in urban areas.
I loved the sound of my 1.9/1.6 but it got annoying after a while.
I'm really considering glass packs for my AAZ build...
thoughts?


Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD

Reply #1July 08, 2010, 05:06:28 am

gldgti

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Re: Lets have a muffler thread
« Reply #1 on: July 08, 2010, 05:06:28 am »
IMHO, depends on your turbo more than anything. My mk3 is a daily hiway commuter and for half the trip I have my significant other in the car - and its an hour each way. So, I habe 2.5" from the turbo all the way ou the back (twin tailpipe tip that points the smoke at the road a bit).  I have a straight through rear muffler , and a 12" long fluted resonator about halfway.

With a T3, its got a decently loud note on full acelleration but is pretty quiet in the cruise. With a T2, its dead quiet all the time. With the current K14, its still got a note, but about half as loud as the T3.

I totally agree with the old addage that "the turbocharger is the worlds most expensive muffler".

'77 Golf LS 4 door twincharger project
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Reply #2July 08, 2010, 08:24:52 am

catlin_cava

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Re: Lets have a muffler thread
« Reply #2 on: July 08, 2010, 08:24:52 am »
My 1.9 with K03 was a 2.5 Straight pipe from the turbo back and it wasnèt too bad,
Catlin

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Reply #3July 08, 2010, 10:57:17 am

RadoTD

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Re: Lets have a muffler thread
« Reply #3 on: July 08, 2010, 10:57:17 am »
My 1.9 with a K14 and 2.5" straight pipe doesn't bother me at all. I can hardly even hear it over the sound of my engine

Maybe instead of a muffler, you just need another turbo on there?

enough boost is when you have 3 dimple marks in the hood from the valve cover nuts..  ;D

Reply #4July 08, 2010, 11:16:43 am

tindias

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Re: Lets have a muffler thread
« Reply #4 on: July 08, 2010, 11:16:43 am »
On my supercharged 1.6 I had 2.5 in no cat, no muffler stack that comes out right behind the driver side of the bed.....gave me horrible head aches.  I have a long swirl pack muffler on there now, it sounds better and doesnt leave me reaching for Advil ;D
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Reply #5July 08, 2010, 11:47:42 am

BAM

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Re: Lets have a muffler thread
« Reply #5 on: July 08, 2010, 11:47:42 am »
My daily is a 1.9l k14, no cat, into VR6 Magnaflow cat back system(2.5").  It only loud under heavy load, always spooling.  Not offensive.
Cabby running 2.5" stainless off header to rear with Magnaflow resonator in the factory muffler positions - offensive, police called.  Rabbit straight pipe at 2" will be getting 2.5" stainless new 1.9l that is waiting to be installed.  Wifes car running OEM.

Reply #6July 08, 2010, 12:27:52 pm

Smokey Eddy

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Re: Lets have a muffler thread
« Reply #6 on: July 08, 2010, 12:27:52 pm »
On my supercharged 1.6 I had 2.5 in no cat, no muffler stack that comes out right behind the driver side of the bed.....gave me horrible head aches.  I have a long swirl pack muffler on there now, it sounds better and doesnt leave me reaching for Advil ;D

yes, I should have mentioned my turbo is a T3. It had me reaching for the Advil after long drives. I just hate the drone of it on the highway. I have two heavy duty isolators hanging the ehxaust from the floor pans. I think i should add some sort of muffling device...
It had gotten to the point that i was going to throw a few 100 pounds of sound deadening material around the firewall all the way back to the end of the trunk.

And yes RadoTD, perhaps i do need another turbo... you're right.
Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD

Reply #7July 08, 2010, 03:20:34 pm

clarkrep

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Re: Lets have a muffler thread
« Reply #7 on: July 08, 2010, 03:20:34 pm »
In my mk1 gti with a 1.6td I have 2.5" mandrel turbo back with a Magnaflow straight through. It's a diesel series if I remember right. Was a bit of a pain to fit behind the rear beam because the case is 18" long x7" diameter. Works well though, it has a decent throaty sound but no drone to speak of.
Btw that's with a K24
'79 Rabbit Diesel L 1.5
'83 Rabbit GTI 1.6TD

Reply #8July 08, 2010, 04:12:55 pm

Smokey Eddy

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Re: Lets have a muffler thread
« Reply #8 on: July 08, 2010, 04:12:55 pm »
Where should i buy a muffler(s)? and where should i put them?
It would be fun to have two and use them as exhaust tips opposed to the really badly oxidized $10 ones i have now.
Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD

Reply #9July 08, 2010, 05:22:01 pm

arsenicpants

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Re: Lets have a muffler thread
« Reply #9 on: July 08, 2010, 05:22:01 pm »
does anyone have an exhaust that dumps right after the downpipe?
ie: no exhaust past the engine bay?

does it get to be too much drone?
does it make a difference in power at all?
« Last Edit: July 08, 2010, 05:29:48 pm by arsenicpants »

Reply #10July 08, 2010, 05:31:28 pm

Thezorn

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Re: Lets have a muffler thread
« Reply #10 on: July 08, 2010, 05:31:28 pm »
does anyone have an exhaust that dumps right after the downpipe?
ie: no exhaust past the engine bay?

does piping it all the way back make a difference in the sound?
or in power?

Im pretty sure no one really wants to have there exhaust dump right after the engine bay, in turn being right under you. First of all all the soot from your exhaust would cover the bottom of your car in no time and second it is the loudest thing you'll ever hear in your entire life. When I was changing the exhaust a while back on my car to a 2.25" straight pipe I took it for a ride around the block. Needless to say I couldn't even hear the guy sitting next to me when he was pretty much yelling. Not very convienient.
As for the rest of the exhaust the only way it will add power is if your current exhaust is to small and restrictive and you replace it with a larger, better flowing system
Compounded 93 AAZ

Reply #11July 08, 2010, 07:56:40 pm

clarkrep

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Re: Lets have a muffler thread
« Reply #11 on: July 08, 2010, 07:56:40 pm »
I would have to agree with Thezorn. I ran mine with just a downpipe for a little because I couldn't wait to drive it. It sucked. I then built the system I mentioned above and couldn't tell any difference in power at all.
Admitedly though I doubt that it was makin more than 90hp....
'79 Rabbit Diesel L 1.5
'83 Rabbit GTI 1.6TD

Reply #12July 08, 2010, 08:02:58 pm

Smokey Eddy

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Re: Lets have a muffler thread
« Reply #12 on: July 08, 2010, 08:02:58 pm »
I did notice a power increase in my build when i did that but it wasn't worth the stench of exhaust or the deafening racket it made.
Ed
Blacked out mk2 AAZ Jetta RIP. You are missed.
White 1999.5 ALH Golf 2dr. Low & wide. Rammed off the road RIP.
Blue 2009 CR140 Jetta CBEA/CJAA. Malone stage 2. EGR/DPF/Exhaust-valve deletes. 2.5" open exhaust. ADP Turbo swap. 1-stage nitrous kit. THROWN ROD

Reply #13July 09, 2010, 12:41:03 am

Thezorn

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Re: Lets have a muffler thread
« Reply #13 on: July 09, 2010, 12:41:03 am »
As for the loudness of the exhaust, like stated above, your turbo has a huge impact on how your engine is going to sound. For instance I have an AAZ with a K14 and under hard exceleration at low rpm it is quite loud, and of course WOT is loud also, But in the mid range the sound is not bad at all. Definatley no where near as bad as a straight piped civic I saw earlier today.
Compounded 93 AAZ

Reply #14July 09, 2010, 10:46:14 am

FoXBoXRaCiNG

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Re: Lets have a muffler thread
« Reply #14 on: July 09, 2010, 10:46:14 am »
I had a MagnaFlow dual tip muffler on the end of a 2.25" DP back exhaust, just enough muffle to kill the drone, and not be too loud.... So I chopped and replaced with a foot and a half of 5" semi stack, basically straight DP back, way louder with some drone in the drivers seat, amazingly, the passenger seat was way louder, and the drone unbearable... Last time I sit there  :o
My cat has A.D.D :(

 

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