Hey guys, well i'm looking for some new ways to defend my car from thieves - And I have an idea to hook up soem sort of gas to my alarm, so when its triggered, gas is dispensed.

It needs to be a non-lethal gas (Like mase or bear-spray I suppose), but also has to be able to NOT stain/create a huge mess. I'd much rather replace stolen audio equipment and entire new interior.

Is there anything you guys could suggest I use?

Putracine....

There was a product invented in South Africa that draws gas from your tank for a flame thrower on the sides of the car.

It was actually 4 propane bottles connected to a valve under the seat.

African ingenuity, putting propane under cars

keke...
Then there's tetrahydrofurane or butyric acid ... none of which I'd be putting into my car of course.

some OC dissolved in DSMO, pumped from sprinklers above the door?

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That, is awesome sir.

Butyric acid doesn't smell that bad . The esters of it smell even better!

Easiest way I can see is to have a simple solenoid-operated valve switching OC foggers, say, from around the weatherproofing strip alongside the top of the doors. Hook them up to a simple circuit pulling a little juice off the car batt, when the link is broken (say, a door opened/glass smashed/etc) the coil de-energises, solenoid disengages, releases the pin or catch on the foggers. Pssssht!

Blow-off valve from hell.

Okay, if you actually find a good gas to use and really do it, POST PICS OMG. That would be amazing and maybe a good text file as a DIY.

w00t

Ummmmm wouldn't all you really need is a visible gas/smoke and a slight odour. Maybe a prank shop/ commercial smoke bomb and a prank shop stink bomb.
I've never broke into a car but I know if I did and a cloud of scented smoke came out I'd get the fuck out before I started to think is this toxic?

You don't need to incapacitate, just scare and screw with the mind.