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DURATEC Performance (2003-2007) The place to chat about any Duratec 23, 23E, and 20 engine performance, tuning and exhaust related upgrades.

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Old 03-30-2013, 07:14 AM   #21
fozziebear
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All Duratech's had the mani cat from the get go in 04.The cats can flow far more than what these engines can push out.You will not see any consistent or measurable gains by deleting the cats.If you want to get a header then pick up a small Magnaflow universal cat and put it in right after the header flange and relocate the o2 sensors.You will still have a fully functioning cat monitoring with no emissions worries and get the performance boost with the header.
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Old 04-10-2013, 01:55 AM   #22
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i thought only pzev had 2 cats? non pzev was just a resonator? i also live in cali and before i got my FSW race catback i just cut my pzev 2 cat out welded in a piece of same size pipe and called it good. have original exhaust still and plan to weld the cat back in for smog reasons next year so i can swap back when need be. plan on getting fsw 4-1 this weekend and see how loud it gets:) i dont like people in my car atleast back seat so hopefully it drones!! it already does a bit..
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Old 04-10-2013, 02:06 AM   #23
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Quote:
Originally Posted by fozziebear View Post
All Duratech's had the mani cat from the get go in 04.The cats can flow far more than what these engines can push out.You will not see any consistent or measurable gains by deleting the cats.If you want to get a header then pick up a small Magnaflow universal cat and put it in right after the header flange and relocate the o2 sensors.You will still have a fully functioning cat monitoring with no emissions worries and get the performance boost with the header.
I know where i live every smog shop checks EVERYTHING!!! they look under everything i even had a shop put a car on a lift to make sure cats weren't moved from factory location or o2 location.. the old unplug battery or clear codes right before going doesn't help either they can see if that has been done and u have to drive 40 miles for the computer to go through all its tests again.. sniffer dyno test sniffer idle test evap test timing check obd check all vacuum routing has to be factory its stupid! luckily there is still a few people in town i know that have there own machines and r willing to dirty smog for a 12 pack and 100 so when turbo swap is done don't need to worry about that:) i have seen a few smog stops on the side of the road and as u drive by a peace officer directs u to the portable machine... some peace officers even will have u pop your hood and check stuff out for even a tail light out if he wants to he does if not he sends you to ref anyways...
i believe last year california denied i bill wear 2000 and newer was obd only test but it was denied of course!
im uncertain if we have to have second cat to pass smog though? my car is pzev so idk if i want to risk failing and having to smog every year rather then every 5
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Old 04-10-2013, 11:21 AM   #24
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Yes, I am curious too because I cut of the cat in between the lunch box and resonator, my car is a SE, but the round thing dident look like a cat on the inside!
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Old 04-10-2013, 11:23 AM   #25
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Yes, I am curious too because I cut of the cat in between the lunch box and resonator, my car is a SE, but the round thing dident look like a cat on the inside!
Hmm , maybe you got the res instead of the cat , a few pics should help us clarify

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Old 04-10-2013, 12:20 PM   #26
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If you have to pass a inspection, What are they going to say if you use a 23 st mani/cat & a flex back 2.5'' system? The 23 st mani/cat is the best flowing oem manifold.
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Old 04-19-2013, 03:45 PM   #27
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Hmm , maybe you got the res instead of the cat , a few pics should help us clarify

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The resonator is at the end of the exhaust, it's the "lunchbox". 2nd gens have the following setups.

-Pzev sedan/coupe
Mani-cat
2nd cat
Muffler
Resonator

-Non pzev sedan
Mani-cat
Muffler
Resonator

-Non pzev coupe with a manual (Sport tuned exhaust)
Mani-cat
Muffler
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Old 04-19-2013, 04:00 PM   #28
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Quote:
Originally Posted by 09vistabluecoupe View Post
The resonator is at the end of the exhaust, it's the "lunchbox". 2nd gens have the following setups.

-Pzev sedan/coupe
Mani-cat
2nd cat
Muffler
Resonator

-Non pzev sedan
Mani-cat
Muffler
Resonator

-Non pzev coupe with a manual (Sport tuned exhaust)
Mani-cat
Muffler
People must stop calling it a lunchbox muffler lol

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Old 04-19-2013, 04:35 PM   #29
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Quote:
Originally Posted by 09vistabluecoupe View Post
The resonator is at the end of the exhaust, it's the "lunchbox". 2nd gens have the following setups.

-Pzev sedan/coupe
Mani-cat
2nd cat
Muffler
Resonator

-Non pzev sedan
Mani-cat
Muffler
Resonator

-Non pzev coupe with a manual (Sport tuned exhaust)
Mani-cat
Muffler
Actually no. Non pzev have :
Manicat, resonator,muffler, then the lunchbox muffler.. I personally cut them off of my car(:
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