So.. I bought the 34.100 AEM Digital Wideband but I can't find a preexisting hole to route the cable into the inside of the car. Anyone has a clue what pre-existing hole i can use?

 

Some use the gear shifter opening in the trans tunnel or you can run it in through the hole for the wiring harness.

 

pics?

 

Top left corner where the engine harness goes into the firewall, you'll see the skinnier wire run in with it, that's where I routed mine.

 

I'll try it but that entire space is covered with crap on mine aka stock touring

 

If you are putting the sensor near the downpipe/midpipe flange then the shifter opening is a really easy spot for routing.

 

How about if your car is an automatic?

 

I'm not sure what size your connector is on the AEM but I've successfully routed my PLX wide band through the opening in the passenger wheel well. If this is already used there is a similar opening in the drivers wheel well.

Here's a pic of the driver's one, taken once the fender liner is removed:
. Credit for this pic goes to this battery relocation writeup. (link)

 

I'm using the same opening as James Paventi for my LC-1, battery cable, and a vacuum hose for my boost gauge/water injection. (on the drivers side)

 

It's surprising how big that opening is. My driver's side has a 2 gauge battery positive. The passenger has my wide-band, a vacuum hose and a wire from my PLX temp sender.

I was thinking about it and I recall that I had to dissemble the wide-band's cable connector. I took the pins out of the connector, pushed the cable through and snapped the pins back in.