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Old 02-03-2010, 01:49 PM   #1
kenliu84
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Default low noise exhaust - downpipe and catback exhaust?

Hello,

I am looking into improving the exahust system of my 06 WRX wagon and then finally tune it at a shop. I want something simple, produces an improvement in power and does not produce a lot of noise compared to stock.

After doing some research on NASIOC, although kind of had a hard time searching for exhaust threads, I am looking into getting a downpipe (no brand yet) plus a Magnaflow catback exhaust system.

Does anyone have any comments on my proposed set up? Any recommended down pipes, alternative catback systems?

FYI, I have a relatively simple set up on my car: K&N typhoon Air Intake, STBs front and rear, 25mm front and 22mm rear swaybars, Kartboy endlinks all around, Kartboy short throw shifter, wider and lighter wheels and performance tires. Once I install a new exhaust system, I'm going to tune it to get the most gains.
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Old 02-03-2010, 02:31 PM   #2
seest
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While i dont have experience with that cat back, if you are looking to stay quiet just replace your DP.

I run just the cobb catted DP with the AP on my car, keeps me quiet and gives me most of the power in a full TBE (-1 or 2 hp).

Last edited by seest; 02-03-2010 at 02:46 PM.
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Old 02-03-2010, 02:38 PM   #3
wrxchase
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i ran a greddy evo2 with a catted downpipe. and its was super quiet. but you have a 4in tip on the exhaust. it gave me all the power i wanted with out the big sound while just cruising. if you step on the gas it will scream.
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Old 02-03-2010, 02:54 PM   #4
kenliu84
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Quote:
Originally Posted by seest View Post
While i dont have experience with that cat back, if you are looking to stay quiet just replace your DP.

I run just the cobb catted DP with the AP on my car, keeps me quiet and gives me most of the power in a full TBE (-1 or 2 hp).
Seest, what's an AP?

Quote:
Originally Posted by wrxchase View Post
i ran a greddy evo2 with a catted downpipe. and its was super quiet. but you have a 4in tip on the exhaust. it gave me all the power i wanted with out the big sound while just cruising. if you step on the gas it will scream.
chase, not sure what you mean "you have a 4in tip on the exhaust". You referring to the Magnaflow? maybe you were talking about the greddy evo2. if that is the case, I don't want to "scream" or go too loud when I step on the gas, I want a system all around that won't be much louder than stock.

I am assuming a catted downpipe is a downpipe with a cataylic converter integrated with it.

thanks for the quick replies, guys.
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Old 02-03-2010, 09:08 PM   #5
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Having used magnaflow mufflers in the past on a variety of applications, I feel qualified to tell you that it will probably be louder than what you're shooting for. Think: LOUD drone at 70 mph.
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Old 02-03-2010, 09:09 PM   #6
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When I had my 02 wagon, I had a HKS hi power. It was ungodly loud in the wagon...any exhaust in the wagon will be much louder than the sedan version. I bought an 'exhaust auger' which quieted things down nicely and did not impact on the performance.
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Old 02-04-2010, 03:18 AM   #7
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Currently running a catless downpipe, with the stock catback, and its hardly ANY louder than before. You won't lose much from it either in terms of hp. Maybe 1 or 2

And an AP is an AcessPort, which basically gives you an off-the shelf tune from COBB, allowing you to run a new DP and gives your car a nice boost. It's what many people refer to as "stage 2"
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Old 02-04-2010, 03:57 AM   #8
kenliu84
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thanks for your great input and answers, guys, especially buzz as he personally used Magnaflow before.

I intend to still get a catted downpipe with a cat-back exhaust system. I don't want a catless DP because of inspection and I want to help our problem on earth.

after your posts, I went on some websites to shop around some more and read a little more on exhaust systems. anyone used the HELIX catted DP from Gruppes? What about the Greddy SE catback exhaust system? any recommendations on DPs or CBE systems for low noise?

It seems like a DP is a must if I want performance increase with low noise. thanks in advance.

-Ken
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Old 02-04-2010, 09:48 AM   #9
woody06967
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4" APS DP with Fuji RM01A exhaust is really quiet but it's catless.
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Old 02-04-2010, 10:50 AM   #10
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Im looking to do the same as the OP, I want a quiet exhaust to go stage 2. I've heard that the borla or SPT exhausts are relatively quiet. I'm considerind doing just a downpipe but I want to explore all my options
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Old 02-04-2010, 11:56 AM   #11
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i have an invidia catless dp mated to an SPT catback, and it sounds great. nice and deep, and no drone on the highway.
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Old 02-05-2010, 12:25 PM   #12
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Quote:
Originally Posted by kenliu84 View Post
thanks for your great input and answers, guys, especially buzz as he personally used Magnaflow before.

I intend to still get a catted downpipe with a cat-back exhaust system. I don't want a catless DP because of inspection and I want to help our problem on earth.

after your posts, I went on some websites to shop around some more and read a little more on exhaust systems. anyone used the HELIX catted DP from Gruppes? What about the Greddy SE catback exhaust system? any recommendations on DPs or CBE systems for low noise?

It seems like a DP is a must if I want performance increase with low noise. thanks in advance.

-Ken
I'm running a Helix catted DP with WBR exhaust. Gives it a stock look that has a nice rumble at idle and its pretty quite when cruising...
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Old 02-05-2010, 01:30 PM   #13
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quiet exhausts:

Maddad Whisper
Vibrant StreetPower
Stromung
Borla Hush
Haywood & Scott (I heard they are quiet, but have no 1st hand experience w/them.)

Also having a catted DP will keep the noise down a bit more than w/o the cat.

http://www.daddysscp.com/category_s/21.htm (sells all the exhausts I listed above, except the Vibrant).

Link to the Vibrant: http://www.crucialracing.com/product...ds/exhaust.php

Last edited by csmithwrx'05; 02-05-2010 at 01:36 PM.
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Old 02-05-2010, 02:36 PM   #14
DirtyBanana
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I believe the cobb exhaust is fairly quite. Sounds really nice in person as well.
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Old 02-06-2010, 09:34 PM   #15
kenliu84
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thanks for all of your input, I'll do more research and then purchase.

hey csmith, you have experience with all those you listed except the last?
did you ever run a dyno on any of them that showed it increase HP while keeping the noise down?
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Old 02-06-2010, 10:27 PM   #16
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Quote:
Originally Posted by scotty144 View Post
When I had my 02 wagon, I had a HKS hi power. It was ungodly loud in the wagon...any poorly designed, fartpipe exhaust like the hks in the wagon will produce poor results
.............
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Old 02-07-2010, 04:09 PM   #17
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Just make sure that whatever downpipe you get is catted, that will reduce the noise greatly. I have a full Cobb TBE, and it is not much louder than stock.
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Old 02-07-2010, 11:58 PM   #18
livinglegend629
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Quote:
Originally Posted by 2010 WRX Limited View Post
Im looking to do the same as the OP, I want a quiet exhaust to go stage 2. I've heard that the borla or SPT exhausts are relatively quiet. I'm considerind doing just a downpipe but I want to explore all my options
Yea I have my exhaust set up with an SPT and its great. Not very loud when cruising around and sounds great when you hit the gas. My neighbor has an 06' sti as well and he has an Apexi GT and I can hear him coming from a block and a half away.

Just my .02 cents
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Old 02-09-2010, 07:46 PM   #19
Bandit00
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I ran the Greddy Ti-C on my 2006 wrx. sounded sweet to me. The Cobb downpipe is always a good choice as well. Fitment is the key to a nice sounding exhaust.
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Old 02-09-2010, 08:17 PM   #20
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Once you did the typhoon you should have been tuned because of the air/fuel ratio... you dont want to run too lean. The cobb maps do not have that in the mapping to adjust your air/fuel ratio. I suggest getting your turboback done asap and getting tuned. It will be like day and night after the tune. I just installed on my 09 wrx the invidia high flow cat dp and the invidia q300 exhaust.....big deep rumble and cops wont hear you from a block away...good luck
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