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  #1  
Old July 11th, 2010, 11:44 AM
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Tdi Muffler - Yes or No?

My 200tdi has a cheapo offset muffler on it and I am considering removing it and running straight exhaust. Has anyone with a tdi done this? Any noticeable reduction in heat or increase in noise?
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  #2  
Old July 11th, 2010, 12:19 PM
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I have both - a lightweight with a 200 and a D90 with a 300. Lightweight has a muffler and the D90 is a straight pipe. I don't hear much if any difference.
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Old July 11th, 2010, 12:22 PM
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Yeah, mine seems pretty pointless and is actually doing more harm than good.
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  #4  
Old July 11th, 2010, 01:39 PM
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Any performance gain by going the 3" route from front to rear with nothing but straight pipe ?

Thanks !

Pat
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Old July 11th, 2010, 01:40 PM
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I thought the turbo needed a little back pressure from the exhaust to work properly. At least that is what I was told. not true?
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Old July 11th, 2010, 02:44 PM
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I pulled the muffler and there is no difference in sound at idle, but it's of course a little louder at speed. I did not notice any difference in performance and really wasn't expecting any. My "stock" muffler and the pipe behind it were in the way of a lot of things, including my auxiliary air tank and A-arm.
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Old July 11th, 2010, 03:30 PM
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Quote:
Originally Posted by Retrofit View Post
Any performance gain by going the 3" route from front to rear with nothing but straight pipe ?

Thanks !

Pat
I have been running straight 3in pipe from the header back with one bend in it for a long time. It is louder. Not obnoxious, but louder. There is a noticable difference in EGT's. They still climb but they fall MUCH quicker. If you have the motor tuned up, its a great mod.

Quote:
Originally Posted by discotdi View Post
I thought the turbo needed a little back pressure from the exhaust to work properly. At least that is what I was told. not true?
No truth to this. On a diesel, the less backpressure the better.
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Old July 11th, 2010, 03:56 PM
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Just had mine taken off of my 300tdi D90. There really is no noticeable difference in sound and it looks a lot cleaner with a simple chrome tip down pipe.
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  #9  
Old July 11th, 2010, 06:05 PM
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No muflers.. Just a SS straight through resonator...
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  #10  
Old July 11th, 2010, 06:33 PM
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turbos need a little backpressure.
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  #11  
Old July 11th, 2010, 08:13 PM
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Straight pipes are not much louder in the vehicle, but for people outside, in the direction of the exhaust, it is quite a bit louder.
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Old July 11th, 2010, 08:56 PM
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It is louder. I wheel with no top on and it is noticable. Not terribly annoying, but louder.
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Old July 11th, 2010, 09:02 PM
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Quote:
Originally Posted by rover4x4 View Post
turbos need a little backpressure.
Backpressure downstream of the turbo will only limit the turbo's ability to do the most work possible with the available inlet pressure. Ideally, you want NO backpressure after the turbo.
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  #14  
Old July 11th, 2010, 09:13 PM
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I've never had a muffler on mine...
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Old July 11th, 2010, 09:38 PM
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Quote:
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I've never had a muffler on mine...
Answer this honestly though. Was my engine little too loud when I was doing the suicide line on Claw?
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  #16  
Old July 11th, 2010, 09:50 PM
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I'm not understanding the difference between this and the factory set up. Do you guys mean taking out the silencer ?
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  #17  
Old July 11th, 2010, 10:42 PM
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Quote:
Originally Posted by rover4x4 View Post
turbos need a little backpressure.
based on how the develop the power to force the intake air, i'd agree.
you'd want as little resistance as possible before the turbo, but a little bit of resistance afterwards. correct me if i'm wrong?
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  #18  
Old July 11th, 2010, 11:01 PM
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You want no back pressure in the exhaust downline from the turbo. This allows the exhaust gasses which are being pushed out of the engine to pass through the exhaust vanes of the turbo as fast as possible. Maximum speed gives fast spool to boost levels. The turbo vanes themselves do a lot to quiet the exhaust note. When time allows I'm going to have a 3 inch made from the end of the downpipe back. On a 130 that noise should be far enough behind the passenger cabin the difference if any shouldn't be notice able.
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  #19  
Old July 12th, 2010, 01:18 AM
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Quote:
Originally Posted by Buckon37s View Post
Answer this honestly though. Was my engine little too loud when I was doing the suicide line on Claw?
Not sure how to answer that...

it was loud, screaming loud even... but I didn't feel the need to have ear plugs (and I wear earplugs on the freeway with mine) so too loud? meh...

It's only loud when you've got your foot all the way in it
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  #20  
Old January 10th, 2011, 12:49 AM
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Any updates from folks living with straight through exhausts. I use my 110 for longer distance trips with the wife and kid. This past weekend the tailpipe separated from the rear silencer. I am thinking about removing the centre and rear silencers and having some stainless run straight back. I am hoping to avoid highway drone and excessive noise on the trail....

Henry
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