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Old 06-15-2010, 03:39 PM   #26
mr_subaru_rs
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Chapter/Region: W. Canada
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good call on keeping the UEL headers. Ive had mine on for 2 days and never want to back to stock!!!
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Old 06-25-2010, 11:55 PM   #27
Smoke
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I've been looking around and I have seen no observations on catless exhaust.

Does going catless contribute to the boxer rumble or deepness at all?
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Old 06-26-2010, 10:31 AM   #28
kero
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^^ Going catless via trackpipe makes the car much louder, I wouldn't say deeper per say but that also depends on the catback/axleback you have.

My turbo xs was just to darned loud with the current setup. It sounded great though but in stop and go traffic and or merging on the highway, it just becomes annoying and agitating.

After finally putting on the 07 wrx axleback (a temporary solution) the car is crazy quiet. I still have the valve sound from the headers but that has also quieted down a bit, I think because that sound was also being excerbated by the turbo xs axleback.

Not to forget my car stinks to high hell when in traffic and or on startup or sitting at lights.

The only plus I have seen thus far is def improved power and gas mileage. I would assume because there are practically no exhaust flow restrictions on my setup.

I miss the burble now and am thinking on the best axleback to put on keep her quiet but enjoy the burble. The only issue is that since I have a trackpipe and not a catpipe, any axleback is gonna be louder than if I had cats, so I have to plan correctly or I will be back in the same boat again.

I had to have a local tuner permanently edit the ECU map to remove the P0420 cat deficiency cel which I got every time I cleared the ECU.

So passing inspection was easy but had to go to a shop that I knew wouldn't look under the car.
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Old 06-26-2010, 11:54 AM   #29
Smoke
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Louder as in everything is louder? The rumble and note?
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Old 06-26-2010, 02:16 PM   #30
Audi20Tdriver
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honestly, for a daily driver going catless is stupid for a number of reasons.. 1) it is extremely loud and not in a good way since it gets very raspy. 2) it stinks and there is no reason to have that kind of gross emissions output for you and others in traffic like that.. on a 2.5i maybe you are gaining like 2 Wheel HP by having a track pipe.

The OP and your car would sound much better with UEL, a hig flow cat and a quality exhaust like stromung.
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Old 06-26-2010, 02:24 PM   #31
Audi20Tdriver
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Quote:
Originally Posted by Da-Risin-Smoke View Post
I've been looking around and I have seen no observations on catless exhaust.

Does going catless contribute to the boxer rumble or deepness at all?
if you search in N/A there are a number of threads where it is discussed.
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Old 06-26-2010, 09:23 PM   #32
kero
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Quote:
Originally Posted by Audi20Tdriver View Post
honestly, for a daily driver going catless is stupid for a number of reasons.. 1) it is extremely loud and not in a good way since it gets very raspy. 2) it stinks and there is no reason to have that kind of gross emissions output for you and others in traffic like that.. on a 2.5i maybe you are gaining like 2 Wheel HP by having a track pipe.

The OP and your car would sound much better with UEL, a hig flow cat and a quality exhaust like stromung.
I didn't go catless on purpose, I traded my entire oem setup for a local buddies uel setup and it came with a trackpipe, **** happens I guess.

My setup was not raspy as I had double resonators on my centerpipe so that was not an issue.

And yes, an HFC and stromung axleback would have been better but that was not in the cards for me. The funny thing is that when I was EL with oem headers, I originally had a brand new stromung catback, sold that as I needed money, then sourced a stromung dual tip axleback, that was old as hell and the glasspack was shot. So I know stromung is a nice sounding exhaust. My only issue is that they don't reach full depth and tone until they warm up. I used to pull into meets sounding awesome, pulled away sounding crappy as the muffler was cold and sounded like it was chocking on itself.

That is why I left the setup as is and just dumped on a 07 wrx axleback. Even with the trackpipe and uel's the car is crazy quiet and for now, I am happy with that.

I do miss the burble and when the time comes to want it back, I will get a better axleback, leave on the double res centerpipe, and most likely get a catpipe.

If money permits, i will get a catpipe anyway, as #1 my car stinks to high hell, #2 it's easier for me to pass inspection (don't have to go to a special shop) #3 it's better for the environment #4 it will help any future axleback not be so boomey as cats act like little resonators.
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Old 06-27-2010, 02:01 AM   #33
Audi20Tdriver
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sounds like a plan. Even with the dual res' no axleback will ever sound great catless. Those will help with the rapines, but the cat has the biggest impact on volume and to a degree tone.

With the stromung, I remember it took a few weeks or about 1,000 miles for it to break in and really sound nice. It comes very tightly packed from the factory and sounds kinda muted and weird at first, which is normal. The packing inside is steel wool vs glass which burns off much slower and is higher quality. You are right about it not sounding as nice when cold but pretty much any exhaust setup is like that. Once the gasses are warm is when it sounds the best. Part of that is how thin the after market UEL is.

When you do finally get a better setup on the car, you should def wrap your headers. It will take away the tick, help retain heat and make it perform better overall. Because of your location, I would coat them after you wrap them.

I had 3 setups for exhaust until I had it where I wanted it.. the winner for me was what I had recommended.
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