resonator [Archive] - GrandAmGT.com Forum

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street_fire
03-20-2011, 05:43 PM
I got a quick question. Does it really matter where i put the resonator at. Before or after the Cat??? I'm redoing my exhaust system and i'm getting a new resonator to put in.

pontiacgt05
03-20-2011, 07:14 PM
definately after. i dont even think its possible to put it before. if your taking it to a shop they should just put it in the right spot any way.

street_fire
03-20-2011, 07:45 PM
definately after. i dont even think its possible to put it before. if your taking it to a shop they should just put it in the right spot any way.

well on my 99 GA the resonator is in before the cat for some reason. That's why i'm asking the this question to see if it matters where i put it. I'm doing my exhaust myself.

AaronGTR
03-20-2011, 07:55 PM
well on my 99 GA the resonator is in before the cat for some reason. That's why i'm asking the this question to see if it matters where i put it. I'm doing my exhaust myself.



No, I really doubt that. All the stock exhausts had the cat first, then the resonator. The cat is much larger than the resonator and needs to be further up in the exhaust tunnel. Plus it needs to be closer to the engine for it to light off as quickly as possible. And I also believe the resonator has to be behind the cat for it to function as it's supposed to because of the harmonics of the exhaust.

pontiacgt05
03-21-2011, 03:51 PM
No, I really doubt that. All the stock exhausts had the cat first, then the resonator. The cat is much larger than the resonator and needs to be further up in the exhaust tunnel. Plus it needs to be closer to the engine for it to light off as quickly as possible. And I also believe the resonator has to be behind the cat for it to function as it's supposed to because of the harmonics of the exhaust.

Yeah, the cat is right at the end of the manifold, right after the down pipe right? I've never seen a car that hasn't had the cat right there.

No, I really doubt that. All the stock exhausts had the cat first, then the resonator. The cat is much larger than the resonator and needs to be further up in the exhaust tunnel. Plus it needs to be closer to the engine for it to light off as quickly as possible. And I also believe the resonator has to be behind the cat for it to function as it's supposed to because of the harmonics of the exhaust.

Maybe you mistook the cat for the resonator?



[edit for grammer, spelling, and correctness. I think that is what you where trying to say? ;)]

street_fire
03-21-2011, 07:59 PM
So what you guys are saying is true which I don't dought it. The pervous owners must screwed up the exhaust system. I'll try to get pictures of what I got to deal with tomorrow.

street_fire
03-25-2011, 11:37 AM
http://a2.sphotos.ak.fbcdn.net/hphotos-ak-ash4/190457_10150444561130251_629485250_17656781_619216 8_n.jpg
http://a6.sphotos.ak.fbcdn.net/hphotos-ak-snc6/196564_10150444560465251_629485250_17656776_550501 7_n.jpg
http://a3.sphotos.ak.fbcdn.net/hphotos-ak-ash4/188576_10150444557180251_629485250_17656767_550637 3_n.jpg

So this was i got under my car for the cat and res. Sorry that i took so long to post pics. It's been muddy and cold in the last few days...

AaronGTR
03-25-2011, 01:04 PM
yeah, that's the normal setup. The long rectangular thing is the stock cat. You can see the rear O2 sensor right in front of the flange connecting the rest of the exhaust. The tear drop shaped thing right behind that is the resonator. :thumbs:

street_fire
03-25-2011, 02:16 PM
yeah, that's the normal setup. The long rectangular thing is the stock cat. You can see the rear O2 sensor right in front of the flange connecting the rest of the exhaust. The tear drop shaped thing right behind that is the resonator. :thumbs:

Ok thanks Aaron for clearing that up for me. I didn't even see O2 sensor there. Wow I need new glasses lol