2.0L LNF Performance Tech 260hp and 260 lb-ft of torque Turbocharged tuner version.

All You Need to Know About Downpipes

Old 03-13-2014, 10:30 AM
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Awesome thread! Thanks for the info
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Old 08-02-2014, 08:49 PM
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great info thanks
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Old 02-13-2016, 02:19 PM
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Quick question, I am prepping to swap my stock downpipe for a TurboXS catted downpipe and wanted to know if the o2 sensor wire reach or if I need to buy on o2 wire extender. I don't think I do but wanted to confirm before I started this small project.
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Old 02-13-2016, 03:25 PM
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Originally Posted by TotalChaos View Post
Quick question, I am prepping to swap my stock downpipe for a TurboXS catted downpipe and wanted to know if the o2 sensor wire reach or if I need to buy on o2 wire extender. I don't think I do but wanted to confirm before I started this small project.
Don't know for sure but my ZZP dp was fine. If your txs pipe has the short tube coming off of it to mount the O2 sensor in you will be fine.
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Old 02-15-2016, 02:57 PM
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Thanks. It has an angled o2 tube coming off of it. I guess I'll just try and see what happens!
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Old 02-15-2016, 04:59 PM
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It will reach, you should be fine
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Old 06-18-2016, 05:28 PM
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I'm comparing the ZZP downpipes currently. Which one do you guys think would be best? Is a catless downpipe better flowing than a catted one? Any HP gain differences with or without a cat?

Catless
400 cell cat
catless w/ 02 bung
catless w/ angled 02 bung

SOO MANY CHOICES?!?!
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Old 06-19-2016, 10:27 AM
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Originally Posted by BoostedDreams View Post
I'm comparing the ZZP downpipes currently. Which one do you guys think would be best? Is a catless downpipe better flowing than a catted one? Any HP gain differences with or without a cat?

Catless
400 cell cat
catless w/ 02 bung
catless w/ angled 02 bung

SOO MANY CHOICES?!?!
Get a high flow cat. No fuel smell and it'll barely affect performance.
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Old 06-19-2016, 01:10 PM
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Originally Posted by BoostedDreams View Post
I'm comparing the ZZP downpipes currently. Which one do you guys think would be best? Is a catless downpipe better flowing than a catted one? Any HP gain differences with or without a cat?

Catless
400 cell cat
catless w/ 02 bung
catless w/ angled 02 bung

SOO MANY CHOICES?!?!
I went with the zzp dp with high flow cat. The amount of hp/tq difference isn't worth the headache from the fumes and having to change it out every year for inspection. Held up for 2 NY winters so far too! But catless does sound sexy..
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Old 09-09-2016, 07:13 AM
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ZZP is 3". is that same as stock?
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Old 09-09-2016, 07:35 AM
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Originally Posted by ThoR294 View Post
ZZP is 3". is that same as stock?

I think stock was 2.5", but it bolts right up. I've got the mpx 3" with angled bung. No cels, and passes Illinois emissions.
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Old 09-09-2016, 08:01 AM
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Yeah I am debating on catted DP and a catback. I just don't want the car to drone while im commuting everyday.
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Old 09-09-2016, 08:04 AM
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Originally Posted by ThoR294 View Post
Yeah I am debating on catted DP and a catback. I just don't want the car to drone while im commuting everyday.
Catless isn't really that loud until you put your foot in it. It's louder than stock, but not terrible.
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Old 09-09-2016, 08:28 AM
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Get the downpipe before a cat back. It's great for daily driving. Almost stock quiet until you get on it. Cold start/ cat warm up drones for a minute but goes away.

Personally I'd get a catted dp if I did it again. Catless throws off my class in SCCA autocross.
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Old 09-09-2016, 09:09 AM
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I need a cat to please NJ visual
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Old 09-09-2016, 12:34 PM
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Yes u do. I had a hollowed out cat welded into my catless DP for NJ inspection.
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Old 09-09-2016, 01:05 PM
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I might just leave the cat in, less gas smell and less sound. If I wanna go ballztothewall I'll get one without a cat haha
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Old 09-09-2016, 01:59 PM
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Originally Posted by KylesMoney View Post
I think stock was 2.5", but it bolts right up. I've got the mpx 3" with angled bung. No cels, and passes Illinois emissions.
Stock SS/TC downpipe is def not 2.5"...

It's closer to 3", if not 3". The restriction is it has two cats and a dimple at the o2 sensor.

Even the stock SS/SC downpipe is 2.75". That's why it boggles my mind when people put a 2.5" downpipe on them.
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Old 09-09-2016, 11:29 PM
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Originally Posted by Staged07SS View Post
Stock SS/TC downpipe is def not 2.5"...

It's closer to 3", if not 3". The restriction is it has two cats and a dimple at the o2 sensor.

Even the stock SS/SC downpipe is 2.75". That's why it boggles my mind when people put a 2.5" downpipe on them.
This. There is also the stamped hole for the secondary o2 senor that makes an odd shape of the pipe on both cars.
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Old 09-14-2016, 07:30 AM
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Seems like this is an ok thread to ask this.... since LHU and LNF are so close....

So over on the Regal Forums, the guys think the second cat (the unmonitored one), is the primary cat, and the monitored cat in the o2 housing (1st cat) is just a "light off" cat. I'm dying to correct them, but I just wanted to make sure I'm right that the unmonitored cat (2nd cat) is only there for clean up duty and most likely strict California emissions. Makes no sense that the primary cat wouldn't have o2 sensors monitoring it.
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Old 09-14-2016, 08:55 AM
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Originally Posted by Staged07SS View Post
Seems like this is an ok thread to ask this.... since LHU and LNF are so close....

So over on the Regal Forums, the guys think the second cat (the unmonitored one), is the primary cat, and the monitored cat in the o2 housing (1st cat) is just a "light off" cat. I'm dying to correct them, but I just wanted to make sure I'm right that the unmonitored cat (2nd cat) is only there for clean up duty and most likely strict California emissions. Makes no sense that the primary cat wouldn't have o2 sensors monitoring it.
Your thinking is correct, the first deals with some NOx, the hydrocarbons, and CO. iirc the second one helps with further conversion of NOx to N2 (strict Cali emissions). Although the o2 sensor only can check for hydrocarbon removal performance, not NOx conversion. So depending on what they claim is the main pollutant would depend on which they call the primary or secondary (nomenclature cluster **** is what is sounds like)
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Old 07-09-2017, 10:46 PM
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Catless downpipe

Question, if I get a catless downpipe I know I'll shoot the check engine light. But if I keep my stock downpipe and put it back for emissions come testing time. Will it remove the check engine light? The price for carted dp is so much lol
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Old 07-10-2017, 10:01 AM
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Originally Posted by Farmbaltss View Post
Question, if I get a catless downpipe I know I'll shoot the check engine light. But if I keep my stock downpipe and put it back for emissions come testing time. Will it remove the check engine light? The price for carted dp is so much lol
You will need to drive the car a bit to make sure the CEL doesn't come back, but yes, many people switch back to stock to pass emissions.
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