in all seriousness, i think that putting a turbo in the na mazda3 sedan would be more about "unique" and less about "financially feasable." and in order to be fair, it's important to compare apples to apples. once you start going into "well a brand new ms3 costs $X and a used sedan costs $X while a turbo kits costs $X" then it's no longer a fair asessment
so here we go. according to KBB, lets look at suggested retail values for excellent condition, same mileage mazda3's. they are both GTs, one is a sedan, the other a mazdaspeed
the used sedan comes to $16.3 while the speed comes to $19.8. so, now you say you have $3.5 to play with to essentially make your sedan more cost effective than buying an ms3
kit-wise, the tri-point kit on st. unit costs $3,999. hmm. so you're already $500 over your budget of making a "cost effective" sedan version of a speed3. and the kit is yeilding about 240hp and 240lb/ft of torque. thta's probably close to the wheel numbers of a stock speed3, about 10% drivetrain loss from the bhp of 263, and 280lb/ft of torque
well...you have the power close, while still going over budget. but really, it is still nothing like the speed. if all you want to do is overpower a speed during a 1/4 mile race, well maybe just another set of tires will help you. other than that, it won't have any of the handling or braking ability that the speed ALREADY HAD. unless you want to spend money on a new suspension setup, tires and wheels, brakes, all sorts of stability components like sway bars, etc. i won't price that stuff out to compare
now you have speed3 sedan. congrats, you just spent all that money to have a mazdaspeed3 sedan. considering that you did it all yourself, or with hookups so you get free labor, im sure it was cost effective. hey guess what, i can fit a 50'' tv in my speed3!
it just don't make sense to me to do all that
