It'll probably hold almost that much power but by the time you get that much power you would have gone through axles and stuff. I think you'd be safe with 500hp/450tq on the rebuild kit. Yes, it would be like a new tranny with the rebuild kit only if all the other components are in good shape like the actual gears and stuff. The major things that are not included with the rebuild kit are the superpump (flows more fluid for better cooling), valvebody (stiffer/firmer/quicker/more accurate shifts & better cooling), throttle oriented shift kit (shifts softly when gently accelerating - shifts firm when at full throttle), and theres some other goodies that I don't remember. Try talking to Sam at
Level 10 (973-827-100) and he'll hook you up if you tell him that Dan Oliver - guy with the 1.6 sentra - sent you.
I would also like to recommend getting a mild stall converter, made specifically for lower RPM's and good torque multiplication unless you know at what RPM the turbo/torque is at. You want to match it up just perfectly so you don't get massive tire spin but yet, you want it to have enough to get you off the line. The converter costs $400 (retail $500) and I'd recommend getting a big tranny cooler, a really good one too, not some cheap 2"x5" cooler. If you went with a lower stall speed, you'll keep the temperatures and the wear down from the tranny which will allow it to last longer.
Also, make a plan on what you're wanting to get accomplished. I messed up and I'm 19 and I'm in debt cause of 2 loans to keep my sentra workin and it's not workin right with warrantied factory stuff. I personally would go for the full transmission, that way the whole tranny would be covered under warranty and you won't have to spend time on labor messing with the internals of an automatic. Also, you get that shift kit, which is awesome. While you're making the plans, figure out what your HP/TQ goal is. Once you figure that out, contact
www.driveshaftshop.com for the axles that can handle the power. In addition to figuring out what your HP/TQ goal is, you need to strategize if it's gonna be a street car or race car. If it's your street car, try going the route of a USDM SR20DE and doing a FMAX / HotShot turbo kit and add a boost controller. That way you can turn off the boost and run 30-40mpg (140bhp) or turn on the boost to 12lbs or whatever and get 12-18mpg (220-350whp). (Basically without boost you're running a SR20DE with 9.5:1 compression, with boost you're running a SR20DE-T with major power.)