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Old 07-22-2010, 07:36 PM   #1
matthewlikewhoa
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Default Question for those who are catless

Does anyone have a setup or know of a set up that does not sound raspy? My current setup is genuine borlas, supers track pipe, and sti cat back. Is there any muffler I can switch to that will take the raspyness away? Will swapping in a mid pipe with a resonator in it help?

I searched and did not find anything. Thank you in advance.
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Old 07-23-2010, 01:38 AM   #2
VIsubi
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Did you also remove your resonator from the system..if so then this can be the cause and is 85% of the reason in most cases..I've heard of people installing...beleive it or not a seond hogh flow cat to take up the job of what a resonator does..basically another cat. other than that theres always UEL headers that could help that out a bit.
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Old 07-23-2010, 12:06 PM   #3
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I have UEL's and no cats, the way I dealt with rasp was to have a STI centerpipe modified to have 2 resonators. I left the OEM resonator in and had the exhaust shop weld in a long cylinder resonator as well.

No rasp whatsoever, this was done originally when I had the turbo xs axleback back one which sounded awesome but loud as F-CK. Now I have a 07 wrx axleback on and have a baby burble with no rasp.
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Old 07-23-2010, 12:22 PM   #4
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So many variables can cause, or eliminate raspiness.
I have a full OBX exhaust (header, small resonator, long resonator, muffler) and no cats.
No raspiness in my system. But, I don't believe having, or not having a cat contributed to it.
I do however, think that the added resonators most likely did. But, I can't back that up with proof.
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Old 07-23-2010, 12:59 PM   #5
kero
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^^ Cats act like little resonators.
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Old 07-23-2010, 01:05 PM   #6
matthewlikewhoa
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Thanks everyone... I guess I will see what I can do about getting a second resonator welded in. The only reason I am saying that the lack of cats is the issue is because I had the headers and catback before I was catless and it was fine. It did not happen until after I took the cats out. So the consensus is that an added resonator should do the trick?
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Old 07-23-2010, 01:36 PM   #7
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I would just put the cats back in, but that's me.
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Old 07-23-2010, 04:13 PM   #8
Skidd
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Quote:
Originally Posted by kero View Post
^^ Cats act like little resonators.
This is true!!
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Old 07-24-2010, 10:59 AM   #9
kero
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Quote:
Originally Posted by matthewlikewhoa View Post
Thanks everyone... I guess I will see what I can do about getting a second resonator welded in. The only reason I am saying that the lack of cats is the issue is because I had the headers and catback before I was catless and it was fine. It did not happen until after I took the cats out. So the consensus is that an added resonator should do the trick?
Just take note there are two types of the bullet or cylinder resonators, baffled and non baffled.

On my modified STI centerpipe I mentioned earlier, the extra welded in resonator was NON baffled, I think the baffled ones quiet things down more but I didn't want to ruin the exhaust flow as I had no restrictions until the muffler.

Down the line, when I finally decided to go back to a louder muffler, I might have a custom centerpipe created with 2 long non baffled resonators instead of the sti modified one. I kinda wish there was something on the market like this already but I guess the demand just isn't there.
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Old 07-24-2010, 12:16 PM   #10
matthewlikewhoa
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Quote:
Originally Posted by kero View Post
Just take note there are two types of the bullet or cylinder resonators, baffled and non baffled.

On my modified STI centerpipe I mentioned earlier, the extra welded in resonator was NON baffled, I think the baffled ones quiet things down more but I didn't want to ruin the exhaust flow as I had no restrictions until the muffler.

Down the line, when I finally decided to go back to a louder muffler, I might have a custom centerpipe created with 2 long non baffled resonators instead of the sti modified one. I kinda wish there was something on the market like this already but I guess the demand just isn't there.

Thanks for the info. Did you take it to a shop and use one of their resonators or did you order one online and bring it with you?
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Old 07-24-2010, 10:46 PM   #11
kero
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Well I was lazy I just went to a meineke shop that I know the owner and ask him to just cut the centerpipe and weld in a resonator, he showed me the difference and I said give me the one that flows better. It works just fine and probably a no name res, hahahaha
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Old 07-26-2010, 10:32 AM   #12
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i would like to know the results of this as i might plan to go this route as well.

thank you.
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Old 07-26-2010, 11:59 AM   #13
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Glad you got it fixed to others a Long glass pack or the addition of cat(s) will solve this problem as well this is why the Random Tech Dual Hi Flow is a good option
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