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Old 06-22-2015, 07:04 AM   #1
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Resonator question

As some of you have seen, my recent exhaust mod, has left me with a lot of rasp, even though since then it has mellowed out a little bit, I am in need of getting resonators welded back in. Now my dilemma is I have 3 different pipe sizes under my car now, I have 3"highflow cats, 2 1/2 inch hpipe and what I assume is a 2" stock overaxle pipe. I still have my stock resonators sitting here, and they should be 2", but should I use those and weld them onto the the 2" pipe OR should I go with an 2.5inch like the Vibrant Bottle style? Which do you think would help out more?
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Old 06-22-2015, 07:50 AM   #2
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Originally Posted by alucard3600 View Post
As some of you have seen, my recent exhaust mod, has left me with a lot of rasp, even though since then it has mellowed out a little bit, I am in need of getting resonators welded back in. Now my dilemma is I have 3 different pipe sizes under my car now, I have 3"highflow cats, 2 1/2 inch hpipe and what I assume is a 2" stock overaxle pipe. I still have my stock resonators sitting here, and they should be 2", but should I use those and weld them onto the the 2" pipe OR should I go with an 2.5inch like the Vibrant Bottle style? Which do you think would help out more?
1. 3" cats is rather large for this application, did you purchase those separate and have them welded in, or are they an off the shelf option from BBK, MAC ... ?

2. The stock OAP is 2.25" so your exhaust is all within .25" of eachother except for the cats.

3. Understand that the in / out of a resonator may measure one dimension, but the actual ID can be smaller than that. For that reason, if you put 2.5" resonators in the 2.25" OAPs it would actually work out to around a consistent 2.25" for the whole OAP. I personally have always used the vibrant resonators and have been quite happy with them. I believe they're 2.5" x 14" or something like that, maybe 16"?
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Old 06-22-2015, 08:01 AM   #3
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1. 3" cats is rather large for this application, did you purchase those separate and have them welded in, or are they an off the shelf option from BBK, MAC ... ?
I got them from my buddy who had a 5.0, they are Kooks Highflows, I still have my stock cats as well, do you think the cats are causing the rasp too? I am hoping the resonators alone will help out alot, it isnt quite as bad as what it was before, but in the lower rpms it is still relevant.
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Old 06-22-2015, 11:01 AM   #4
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We have 2 sets of resonators in my fiance's car lol ... theres only so much you can do to help when deleting the factory cats. Those 3" high flow cats are big for this motor (not necessarily a bad thing) so i imagine they flow enough to sound like a catless car.
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Old 06-22-2015, 03:03 PM   #5
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We have 2 sets of resonators in my fiance's car lol ... theres only so much you can do to help when deleting the factory cats. Those 3" high flow cats are big for this motor (not necessarily a bad thing) so i imagine they flow enough to sound like a catless car.
Ok so as far as the original question, would the original resonators be fine to use? That would probably save me $180 bucks, or should I buy the others?
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Old 06-22-2015, 03:14 PM   #6
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The factory ones are quite small honestly, and i would almost be willing to bet more of a gain comes from deleting those than the cats - or at least its close between the two.
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Old 06-23-2015, 10:33 AM   #7
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not to sidetrack the conversation, but, where are the factory resonators located?
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Old 06-23-2015, 12:11 PM   #8
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immediately after the factory cats.
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Old 06-23-2015, 12:12 PM   #9
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not to sidetrack the conversation, but, where are the factory resonators located?
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Just downstream of the cats.
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Old 06-23-2015, 01:02 PM   #10
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thanks, I appreciate it!
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