You won't be able to find rally suspension so you'll be making that completely custom which will be a royal pain in the you know what. You'll want different engine mounts and such too. The dash I would consider removing but some of the electronics may not like that. It can be done, but it will be many different nightmares one after another. You are probably better off buying a built rally car that is log booked, certified ect and starting there. Unless you have been doing rally for many years already and want to do something different. The 2.5L is definitely a good motor for an N/A rally car, plenty of punch and with a custom tune you could potentially have a competitive car. I would also definitely be looking to add an LSD as well, for rally its a must have. Im sure I missed a few things but if your willing to put in the time and money its a plausible build.I wanted to know peoples opinions on me doing a rally build on my 2016 Mazda 3 hatchback
You don't "need" AWD for rally, it's nice to have, but not required to have fun or go fast. One of my favorite local rally cars is a custom built RSX and they have done really well in it. I've even tempted the idea of buying it from them somewhere down the road as it has been very well setup.My only issue with making the 3 into a rally car is that it doesn't have AWD. Other than that, go for it.