Downpipe without a tune?

[boostiboo]

Soooooo I've been looking and couldn't find a definite answer so I need one lol. Can I run either a zzp or bnr catless downpipe without a tune? The time will be done within a month or so of the parts install (when the money is there) but found out my cat melted the other day and I figured instead of replacing it with oem I could just cram a new dp in, can I do this or will running it without a tune cause issues?

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[Anthony]

I'd be more worried about passing inspection every year with a catless DP. I'm in MA and I have to pull out my DP and install the stock cat once a year to pass.

 

[boostiboo]

I'd be more worried about passing inspection every year with a catless DP. I'm in MA and I have to pull out my DP and install the stock cat once a year to pass.

Kansas. No emissions only vehicle saftey inspections

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[Anthony]

Lucky you! Very jealous.

To answer your question, I don't believe you will NEED the tune. However, the tune will enable the engine to run properly with the DP. I personally wouldn't run the DP without the tune because, from a performance perspective, it's useless.

You will not damage your engine by running the DP without the tune.

 

[4g63gst20]

It's going to turn on your CEL for a oxygen sensor code but other than that should be ok until you can get a tune.

 

[2014 Blue RS]

Main thing is the stock ECU will try to correct for any change/improvement from the down pipe to bring it back to stock.

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[boostiboo]

Main thing is the stock ECU will try to correct for any change/improvement from the down pipe to bring it back to stock.

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I can live with that for awhile but I mean theres no point in me wasting money on an oem replacement when I'm just gunna rip it back out in a month or two

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[2014 Blue RS]

Rip it what out?

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[boostiboo]

Rip it what out?

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TL;DR
My cyrrent cat melted, no sense in replacing with own if going to get a dp anyways, seems like wasted money imho

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[JesusTheAgnostic]

It'll throw a code for malfunctioning cat after about 100 miles. Should be code P0422 4022? Something like that. So you'll have your CEL on but other than that I don't think it'll cause any problems. Just get the tune though you won't have any fun without it, all you'll do is add rasp from removing the cat. Although if you're on the factory set up you might not hear it.

HINT: Remove the passenger wheel and wheel well cover (the plastic liner) it'll make your experience a whole lot easier since the stock downpipe is held on to the engine by a bracket that is nearly inaccessible from under the car. Plus it literally takes like five minutes to remove the liner and wheel.