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Old 02-21-2006, 09:38 AM   #1
vadim
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Default What is the quitest Downpipe and exhaust?

Hey Everyone,

I'm sure this has been covered somewhere before, but there are way too much results for it. I'm also quite sure the quitest exhausts are horla hush and prodrive but what is the quitest downpipe? I'd like everything to sound stock and pass inspection. What could you guys suggest?
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Old 02-21-2006, 09:49 AM   #2
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I would guess that the quietest downpipe would probably have to be a shorty downpipe with the stock 3rd cat. My shorty with a high-flow 3rd cat and stock catback isn't much louder than it was stock.

-Bryce
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Old 02-21-2006, 10:50 AM   #3
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That's why there are sticky posts at the top of each thread buddy, try reading them next time. To save you the effort, a downpipe will not do poop to what comes out of your tailpipe. EVERY downpipe will do the same which is next to nothing as to the level of noise. The only differences I've seen in all my testing/experience is that the TurboXS downpipe, due to its thin walls, puts more noise into the cabin than other downpipes. As to what comes out the back end, they are all the same.
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Old 02-21-2006, 10:55 AM   #4
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go with a full length dp with a high flow cat. some sort of 3" midpipe with a resonator and the sti genome axle back. That should free up some of the restriction as well as keep the stock sound levels.
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Old 02-21-2006, 11:03 AM   #5
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+1 for an MRT TBE.
Cat in the DP, resonator in the Mid and good axleback muffler......quiet!
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Old 02-21-2006, 11:21 AM   #6
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get a DP that has cast top part, as the thicker cast material will cut down on the turbo noises you are going to pick up with a downpipe.

you can find plenty of options for cat back that will reduce noise coming out of the tailpipe, I am completely catless and it is quiet, the turbo is very loud though.

I have catless, stock midpipe, and prodrive axleback.

loud when I get on it though
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Old 02-21-2006, 12:41 PM   #7
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Default Maddad V2

I have the Maddad V2 downpipe with a gutted stock uppipe and a STI catback on a MY04 WRX. I was pleasantly surprised to find that it is no louder than with just the STI catback. The only difference is that if you have the radio off you hear a little more turbo noise, which is probably due to the gutted uppipe.
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Old 02-23-2006, 01:30 AM   #8
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Quote:
Originally Posted by samagon
get a DP that has cast top part, as the thicker cast material will cut down on the turbo noises you are going to pick up with a downpipe.

you can find plenty of options for cat back that will reduce noise coming out of the tailpipe, I am completely catless and it is quiet, the turbo is very loud though.

I have catless, stock midpipe, and prodrive axleback.

loud when I get on it though
if you have stock midpipe doesn't that mean you have a cat in there? So how can you be completely catless?
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Old 02-23-2006, 01:54 AM   #9
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I have the TurboXS Stealth-back (catless) mated to a factory STi muffler, and it is pretty quiet, passes PA state inspection (with a few cell fixes ) Prior to the STi muffler I had that system with the stock WRX muffler and it was even quieter. It is your best bet for performance/subtle noise. It does get loud when you beat on it however, but only engine/turbo noise from the 4inch DP.
-Marc
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Old 02-23-2006, 05:37 AM   #10
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I have to go in for the MRT dual tip myself, it doesn't sound much louder than stock, just deeper.
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Old 02-23-2006, 08:03 AM   #11
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I have the Borla "Hush". I put it in quotations because it isn't so hush. My opinion is it is quite a bit louder than the stocker. However I think it is a great sound. Low and rumbly, gotta love that boxer rumble Anything you do is probably only gonna make it louder and sound less stock, I say search for sound clips and choose the one that sounds the best to you.
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Old 02-23-2006, 10:19 AM   #12
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Here's a quiet DP.
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Old 02-23-2006, 10:35 AM   #13
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^ Sounds stock, passes inspection. Meets all your requirements.
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Old 02-23-2006, 10:49 AM   #14
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Quote:
Originally Posted by WRX03
Here's a quiet DP.
Interesting. Is that welded to the pipe or secured some other way?

-Bryce
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Old 02-23-2006, 11:10 AM   #15
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Quote:
Originally Posted by Carnot
Interesting. Is that welded to the pipe or secured some other way?

-Bryce
He has the welding ground still on it!

Interesting choice though, hope it works out for you.
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Old 02-23-2006, 11:40 AM   #16
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Quote:
Originally Posted by REX8
He has the welding ground still on it!
I saw that, but it could just be used to weld the heatshield back together, not necessarily to weld it to the pipe. Thanks for the insight though.
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