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Hey Ive installed underglow neons recently and ive just had the cord running through the wheel well and in through the door, anyone know a good way to go through the firewall? a good place to puncture it? cuz i wasnt able to find a good place when i installed it.

 
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Underneath the dash on the passenger side there is a rubber grommet in the firewall.

 
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yea, thats the easiest, pull the carpet up on the passengers side floor and there will be a massive gromment you can poke through. otherwise, you have to drill.

 
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^^^Yeah the grommet, although it is pretty hard to get a thicker gauge wire(s) through there. If you need to drill go right under the brake assembly on the driver's side firewall.

 
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you can get any gauge wire through with ease. the trick is to pull the grommet out into the engine bay, then use a long screwdriver to tape the wires to and push it through. I have done it 3 times now with no problems, an put up to 4 gauge wire through.

 
Rep Power: 401

the passenger side gromment is by far the easiest way. you can also drill a hole under the dash on the drivers side, i have wires going through both spots.

 
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cot dam.. i wish i new this b4.. i poked a hole thru a small grommet on the drivers side when i was installing my fogs... was a pain in the neck trying to get to it

 
Rep Power: 607

I put 0 gauge through plus wires for my boost guage and fuel system.

 
Rep Power: 280

No screwdriver... Too hard, use a wire hanger. Gives you a whole lot more play. If it's like most connections for underglow, you are going to have to take apart the plastic clip on the end of the connector to fit it through the grommet.

 
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The passenger side gromet is the best. I put 2 4 GA wires through mine. took 5 mins to get it through with some duct take and a wire hanger. good luck

 
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i tired to find this out for almost a year.. i just didnt wanna cut into my firewall.. but thanks.. now i can use the way you all said