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Engine Specific Info and Questions => TDI Engine -General Info => Topic started by: catlin_cava on January 23, 2011, 03:58:16 pm
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So I'm thinking of putting a straigh pipe on the TDI, The Cat has already been removed Just the muffler left. In New Brunswick we don't have emissions testing, and the Turbo does count as a muffling device.
Whats the Stock size of pipe on the ALH so I can order the pieces I need
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I SUPPORT THIS %100 ;D ;)
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I SUPPORT THIS %100 ;D ;)
http://www.youtube.com/watch?v=xCpnLKhi7ak (http://www.youtube.com/watch?v=xCpnLKhi7ak)
It sounds sexier then a VR IMO
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well, and the fact that VNT turbos are quiet in terms of actual engine exhaust noise, but they SCREAM..
they really whistle alot for a little turbo. i run my VNT with an open downpipe. lol. its not even loud. you can talk to your passenger going 70 without screaming at them.
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well, and the fact that VNT turbos are quiet in terms of actual engine exhaust noise, but they SCREAM..
they really whistle alot for a little turbo. i run my VNT with an open downpipe. lol. its not even loud. you can talk to your passenger going 70 without screaming at them.
I had a straight pipe on my old MK3 AAZ and it wasn;t too bad lol
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i had an actual 2.5" straight pipe on my black rabbit. it had the VNT also. it was so quiet with pipe all the way back, you could just hear turbo scream at idle, no exhaust noise really.
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That guys video didn't sound any different from a stock TDi, lmao. Its the thought though right?
I dunno if opening up the exhaust will really help any with performance.. As I think it is the intake that is more of a constriction on the ALH. Not to mention your still running stock turbo DP.
It will most certainly increase turbo whine though ;)
Still support %100 :p
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You'll be very happy with it straight piped! I have 2.25" from the turbo back and it sounds awsome! Especially at higher revs. On the plus side, it's not too loud, it's quit enjoyable!
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I did 3" straight back. The only comment I got was today. I had a guy from work follow me Friday and today he was in front of me. He said "your car sounds a lot better with a new muffler" Must be pretty loud from behind :D
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what size is the stock pipe on the MK4?
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what size is the stock pipe on the MK4?
IIRC 1 3/4" I got 2.5" Straight through exhaust with my VNT 17/22 it sounds pretty awesome when i romp down on it lol I had people tell me it sounds like a big truck. It doesnt have that whistle tho. Which it got annoying after awhile
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what size is the stock pipe on the MK4?
IIRC 1 3/4" I got 2.5" Straight through exhaust with my VNT 17/22 it sounds pretty awesome when i romp down on it lol I had people tell me it sounds like a big truck. It doesnt have that whistle tho. Which it got annoying after awhile
people always tell me my car sounds like a baby log truck, sans Jake brake.. 8)
and the turbo definitely whistles.. ALOT
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Well tomorrow I'm going down to the auto parts shop and picking up some piping and going to hack off the muffler this week, I'm keeping the muffler in Good condition since if it gets too anoying as a straight pipe i can put it back together(i do alot of highway)
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I think no muffler with the cat is a good sound. No cat no muffler became to loud for me. I had mine like that for 200k miles. But I love the sound of it no with 3inch exhaust and an aaero xl muffler. You hear it when you get on it. I dont miss the loudness at all.
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I had a straight pipe 2.5 before and it was a bit annoying after 5 to 6 hours in the car, but i don't think stock should be too bad,
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The turbo exit is no bigger than 2.25, so theoretically you could run 2.25 all the way back and be relatively restriction free. If you wanted to flow a bit better on the bends (where most restriction occurs) you might do 2.5 but there's not much reason to go any bigger than that IMO, plus it makes it harder to get around the bends without hitting stuff.
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a 2" section of 2.25" pipe will flow much more than a whole exhaust system..
as you add length, it makes i harder to push the gasses thru the pipe..
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That is true, but bends are where the major restrictions occur. It's also assuming that you have enough cfm coming out of the engine to cause a flow restriction (even in a straight pipe)
I'm not sure what the difference between 2.25 and 2.5 would be on the dyno, and I havent done the math, but I can't imagine it would be enough to worry about.
Hence my statement that anything larger than 2.5 being overkill, in addition to the problems of factory fitment.
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smaller pipe makes for a more crackly exhaust.. may not have to worry about that soo much on a diesel, but i know that my diesels were loudest with small exhaust..
i had a 2.5" straight pipe on my rabbit with an ALH turbo.. it sounded really nice..
anything is going to be quiet when it has a VNT breathing into it..
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I agree 100%
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I did it....and just in time I cut the pipe for the muffler and moved the muffler a bit and all the hangers on the muffler where rotten and she fell off :o....
right now i'm running 2" Pipe From the Turbo back and its nice and quiet inside, but you hear the turbo ALOT more and I love it...and from the outside its a noticable differences but not overlly loud.
I am Happy with it.
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Hence my statement that anything larger than 2.5 being overkill, in addition to the problems of factory fitment.
There is no such thing as UNDERKILL ;) ;D ;)