Alright, I have to route a boost/vacuum line through the firewall
 

Any recommendations on the easiest location?

I will be splitting it to source the o2 clamp and the boost gauge, so either side of the bay ok. I have that good feeling either side will be lots of fun..

Thanks

There's a good hole behind the booster can at the master cylinder on the exhaust side- comes out around the pedals. And there's another hole down by the fuse box chassis on the intake side that comes through above the ecu, in the corner. I used an old OE antenna mast for running wires. It did an excellent job of spearing through the rubber insulation matt. - rob

Oh, thats perfect. I even have an old antenna. Finally, keeping all that old crap pays off..

I wish I saw this one.

The one near the pedal is nice and easy, you can pry the gasket off and see what you are doing. But poke a hole through the rubber and thread through that first.

above the ecu on a 1.6 that is