Before i put a roll cage into my car, Guy Light (been doing rally for like 30, or 40 years) told me not to worry about the motor until you i was "flat on the gas the entire stage" and that advice has served me (and my wallet) well.
First thing you need to focus on, and the only thing you need to focus on is passing tech/ minimum scrutineer check . probably the best route is to find out who in your area can log book a car, then check in with that person before you drop cash. ie if John Doe is your log book buy you can send him an email , phone call, etc, "hey i found a roll cage on this website, is this okay?" then maybe he says no wrong type of metal, and then you show him the powerdrive cage kit and he says that cage is okay , if installed correctly.
I believe safedrives.com has a "rally car in a box kit" and they can give you a cage for a lancer.
$2300 ish ,the kit comes with a roll cage, 2 seats, and 5 point harnesses. you can customize the kit for different seats, belts, etc. they also have first aid kits, and triangles (might as well grab those then) and fire extinguishers .
http://www.rallylights.com/SMS/default.aspx they have spill kits, first aid, and intercoms
If you can get the welding , cage fitment done for free.. you are looking at 5K car + 2300 + 200 + intercom ($200 ?) $7700
You will need a skid plate , and rally tires. and you should really try to get some rally suspension on your car. rally suspension will reduce damage to your car and keep your upkeep costs down compared to stock suspension. (ask me how i know
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and you will need suspension and tires. I would recommend JVAB . he is super knowledgeable and makes an amazing product at a great price (about $2K) . he is a very unique character, opinionated and filled with stories. you could also go with allwheelsdriven.net He makes a very similar product but usually includes top mounts and spring bags. they both use bilstein inserts, and are very very similar construction. I think barret is a bit more "straight down to business" he also really knows his stuff. think his go for about $2500.
there are many solutions above that price point , but that's beyond my budget or experience.
a good LSD helps a bunch. when i was fwd i really wanted a 1-way or a 1.5 way plated/clutch style ... i ended up with a Torsen because for my car, it was $900 cheaper than any other option. its a great fit for me because I drive my car around a lot, but its not ideal out on stage.
I think doing a handful of events with an open diff is actually really good from a learning standpoint. a driver can Drift a FWD, Open diff car through the corners.
On the other hand some people are not worried at all about 'driver development' and just want to create the fastest, most fun car for their buck. the community perception is that people leave our sport very very quickly , so we try to steer people away from that route. its Easier to make a costly mistake going that route (high speed off, or mechanical failures) which often discourages people.
BTW, i think that's a fantastic car to start with. (I've only ever wrenched on an impreza so wtf do i know lol)
so 10K total should be your car, log booked, ready to pass inspection, and with some rally suspension.
$900 ish on rally tires, $1000 for proper rims. I went with steel rims for a long while 5 for $100, and you can pound them back to "round ish" with a hammer. if i had the money to avoid that, i would.
so maybe that's 12K of your budget (not paying for labor or an LSD) that should be 3K ... enough to enter 2 rallies if you budget well.