Running open downpipes

[Gustavor]

Those of you running on open downpipes on stock twins, did it do any harm?

 

[Aaron]

I can't imagine how it'd do any harm, however there is a risk of carbon monoxide poisoning when you're not moving.

But there's no real benefit from it either.

 

[Gustavor]

I can't imagine how it'd do any harm, however there is a risk of carbon monoxide poisoning when you're not moving.

But there's no real benefit from it either.

So nothing could happen to the car?

 

[NoQuarter]

Why would you think it might?

Just obnoxious as hell is all.

 

[Gustavor]

Why would you think it might?

Just obnoxious as hell is all.

I read somewhere about how it makes bank 2 run lean and I also got a check engine light not tol long ago

 

[Idratherbesurfing]

I ran open downpipes for months on stock turbos as i sold my exhaust and couldnt pick a new setup. Loud as hell, sounds cool, zero issues, and smells good lol

 

[Idratherbesurfing]

I read somewhere about how it makes bank 2 run lean and I also got a check engine light not tol long ago

I'm not going to tell you that's not possible because anything can happen. But my logs were perfect. Also note i wasnt running OTS maps, always custom maps

 

[Gustavor]

I'm not going to tell you that's not possible because anything can happen. But my logs were perfect. Also note i wasnt running OTS maps, always custom maps

Yeah it turns out is my bank 2 o2 sensor which i should of expected since im at 103k so that's why my check engine light came on

 

[veer90]

I ran open downpipes for a week once for shits and giggles. Other than making my ears bleed, the fuel trims got wonky because the post-cat O2s are too close to the end of the downpipe / ambient air. I got mixture control and "bank 1-2 O2 sensors switched" fault codes intermittently.

Wouldn't recommend it.

 

[Gustavor]

I ran open downpipes for a week once for shits and giggles. Other than making my ears bleed, the fuel trims got wonky because the post-cat O2s are too close to the end of the downpipe / ambient air. I got mixture control and "bank 1-2 O2 sensors switched" fault codes intermittently.

Wouldn't recommend it.

Yeah that's what's happening right now

 

[Jon1998]

I ran open downpipes for a week once for shits and giggles. Other than making my ears bleed, the fuel trims got wonky because the post-cat O2s are too close to the end of the downpipe / ambient air. I got mixture control and "bank 1-2 O2 sensors switched" fault codes intermittently.

Wouldn't recommend it.

im open down pipe, single turbo doc race kit. the car does not like it. Brand new Ntk’s and new rear 02s. I get mixture control codes and also system check codes, as well as fuel trims leaning out. Safe to say no exhaust causing this?

 

[SD Garage]

One of our guys is running downpipe out but has attachments that point the exhaust gases straight towards the ground. No issues.