Yeah I'm going to have to weld one on, and the wideband comes with a O2 sensor. I'm gonna have to weld it as close to the headers as possible to get the best reading.

I still don't know where I'm going to put the gauge in the car.
Anyone have any suggestions?

 

I relocated it to the glove compartment since I rarely use it. I didn't mind gutting my ashtray for this project as I have a like new original ashtray boxed away.

In case I wanted to sell the car I can put the stock one back in and sell the Neo, Boomslang harness and modded ashtray all as a plug n play kit separately.

 

wideband gauge and O2 sensor came in the mail today. I will install that within the next couple weeks.

I may do a DIY on it, and post it up here, because I have not seen a DIY for a wideband install.

 

Wideband installed, tune complete. I can most definitely feel an increase in power, at all rpm ranges.

You can see how lean the car was running from the reading on the wideband, I took the pictures before I tuned it.

I like this setup, because of the availability to conceal it.

Let me know what you guys think!

in the second picture, the apexi/ashtray looks like it's lopsided. That is only because there are two switches underneath it that weren't pressed in, so it was sitting on top of them, now the ashtray sits straight when opened.

 

Close up pic

 

dyno tune or street tune? if dyno what were the gains?

 

I wonder if this will improve mpg?
What other performance mods you running?

 

I just did a street tune, I didn't find it necessary to put it on a dyno. ROCKALEX had the exact same mods as I have, and he gained about 15-20whp so I'm guessing mine are around there as well

 

I have a K&n intake, and a borla rear section exuast with custom mid-piping from the cats to the resonators. Then of course the apexi neo/wideband combo

 

hm..... nice you got this all working but I wonder if the factory ecu will try to reverse the tuning of the neo. Cuz thats what I've been reading before.

 

How did you find the wiring diagram for the 04 gs300 i cant find it??

 

This is an ancient thread. And he used a plug and play harness, so he didn't do any wiring.