Hey guys, i've bought new aftermarket exhaust system for my '06 350z ( Invidia gemini cat-back) and there are no O2 sensor holes in it

What would you recomend in this situation? Drill holes for O2 sensors or modify computer to show no mistakes due to lack of O2 sensors

P.S. sorry for my english

 

O2 sensors are not on the catback. They are just before (upstream) and aft (downstream) of the catalysts. If you have no sensors there (due to testpipes with no bungs or similar), that's a whole different world of hurt.

 

If i'm correct, there are o2 sensors that go right after catalyst, as i highlighted in a photo, for which there are no holes in this new exhaust

 

Invidia Gemini or n1? Both are after the cats, so if you don't have them I think you have aftermarket cats

 

Pics if possible would help

 

Previous owner said that he hasn't done anything to this car performacewise, so i believe currently there is a stock exhaust system mounted.

I've order invidia gemini from here : https://www.all-stars-motorsport.com...000007977.html

 

Photo of my invidia (dont mind the cat )

 

That is the Gemini, it would bolt up to the stock cats, test pipes or after market cats. Like I said pictures of what you are seeing under the car would help


Btw, I had that exhaust for a bit....not bad

 

Exhaust systems in the US or Japan won't have them. I doubt any others will, headers are separate, cats are separate, exhaust is separate. The primary is in the header, the secondary is in the cat.

 

Well i'm from EU and i believe this is the EU version of the Z

I'm not much of a mechanic myself, but from what i've heard from my garage, there are o2 sensors that suppose to go after the cats and there is no way to put them on this exhaust, unless additional holes are drilled i believe

Shouldn't mounting it be the same as in your Z?

 

The picture is correct (generally speaking). O2 sensors before and after catalytic converters. Your new exhaust bolts on AFTER the catalyst so no O2 readings after the pictured "Bank 1 Sensor 3" - which, in itself, is unusual as USDM Zs only have four - two per bank. Maybe Euro market use three for some reason? Odd to me... but then, the diagram is not for a Z anyways, noting the V8 manifolds.

Regardless, your situation is a simple, remove everything aft of the cats and install the new system. Do not tamper with the O2 sensors.

 

So, if i'm correct, o2 sensors go after the cat but before the next pipe joint?

 

Picture shows 8 cylinders, don't think that is for a z

 

3rd time... O2 sensors BEFORE and AFTER the cats and BEFORE the "CATBACK" exhaust system, hence the name.

 

Ok, let me put it this way:
there is a total of 4 sensors, one in each header and one in each cat:
2 cats, 2 headers = 4 sensors, this is the factory setup and there aren't any in the actual exhaust, take pictures otherwise.