Yea, there is a trick though... and it is an engine swap. It is a direct fit engine (so it's not cheating in my mind anyway ), and is pretty much identical to the SR20 engine, except by what I've seen them do, they are probably stronger (I know you are thinking, no way... but you just have to see it to believe it).
Also, for the $6k you would have to install the engine, wire up the computer etc. yourself. That is my budget anyway, and I know of people who are getting close to 200kW while spending a fair bit less. (The engine sells for less than $1000). Oh, and I didn't count all the stuff I already have on the car, such as exhaust (but I'll still need new a dump pipe etc).
Also, for being pedantic, it won't be rwkw, as it is front wheel drive, so maybe a little more power due to their being less drivetrain loss on a front wheel drive. So, on another note, the power will be there, but traction won't.
As for TX5, yea, if it is between an 88-90 then it is the same engine as the MX6.