Valvetronic Exhaust

[hellasf1]

Marginally more high pitched rasp.

No high flow muffler is going to sound massively different to what you have as the stock muffler is pretty much a straight pipe when the valve is forced completely open.

Source: I had a titanium system on my Emira and took it back off due to issues with the Valve causing CELs. But it sounded basically the same as stock with 3rd cat delete and valve controller.

Yeah that’s what I figured. Would aftermarket mid pipe make a difference or the next big difference would be headers as discussed here?

 

[Sentinel]

Yeah that’s what I figured. Would aftermarket mid pipe make a difference or the next big difference would be headers as discussed here?

No mid pipe makes zero difference as there’s no restriction in the stock one. Only flex joints.

Next step is headers if you want to go stupid loud. Any emira with a straight through catless exhaust is going to sound very similar to these videos. There’s no magic here.

 

[Thirdgen89gta]

This is purely an FYI/observation and not a bash or anything against those guys, take it for what it is.
Their header design places the primary o2 sensor in a single runner vs at the collection/collector point of the three runners which in my book and others is a no-no. When this is done the engine is making air fuel ratio changes based on a single cylinders readings, for all three cylinders on that bank instead of making a "global" adjustment based on the reading from all three (making them all run as evenly as possible by taking a reading from all three) This can in turn have the other two cylinders not monitored running rich or lean depending on the monitored third cylinders readings.

I was just considering purchasing these and I spotted that on the pictures too and I can't for the life of me understand WTF they were thinking when they built them.

The O2 sensor location has been updated.

View attachment 49381

The product page pictures still reference old photos then? Those look like headers of a completely different design. That collector and Y-Pipe you posted also looks insanely small diameter.

 

[Thirdgen89gta]

Finally got ahold of Valvtronic, they confirmed they are redesigning the headers. Some of what I got back from the reps made zero sense though in terms of designing in the first place.

They said they advise people who buy the headers to have the PCM retuned to read off the secondary post cat O2s, which is plain stupid. If anything you would just run an extension harness so the primary O2's would install at the secondary O2 bungs.

Never would any engineer designing headers for a race car locate the O2 in a single primary tube unless they were going to run O2's for every single cylinder. Nor would they ever design a Y-pipe with a secondary O2 as Race cars don't care about emissions and wouldn't have a cat to begin with.

Sounds like a bunch of saving face explanations for a bad design.