I'm doing the swap in an '01 and have to pass the OBDII port test. Why wouldn't it? It's a motor out of (for me) and '01+ vehicle that had to pass emissions. The port will show all the CELs I want it to.
HPtuners is great software as is EFIlive. Both are flash programs for the LS series motors from '98 up and provide complete control over CELs.
As for cost, it is more than most of you cheap young bastards can afford without going into credit card debt.
About 4K for the subframe and driveline kit. Another $200 for the clutch hydraulics.
An LS1 goes for around anywhere from $1500-3K depending on the mileage. T56s are in the $1500 range because the can handle pretty much anything you throw at them and are the same size as the Miata trans (though they probably weigh a good 50 lbs more)
I paide $1500 for a freshly built T56 and $2100 for re-ringed and re-bearinged LS6 out of an '01 Z06 'vette. I also had to buy a new intake and TB, plus a $200 LS2 water pump. I had bought a high mileage LS1 w/ PCM and wiring harness for $1K but it's very pricey to get an LS motor new rings and bearings so I sold all that crap and found the latest deal. I was able to sell the old motor minus the PCM and harness for $1K so I pretty much got the harness for free.
I added an LS6 intake for another $350 since my new motor isn't coming with one. Plus odds and ends TB, new plugs and wires, gaskets, various sensors, etc. probably set me back another $300. Then there was the F-body oil pan, baffle and pickup and getting it cut and welded which is another $400.
Clutch: I'm using an used (5k miles) LS7 setup I got for $250 which includes the flywheel, PP, and disk, plus the slave cylinder.
CTS diff: About $700 shipped from the best GM parts wholesaler (which aint gmpartsdirect) They're available in many different ratios. V8roadsters recommended 3.42 for me.
PCM reprogram was only $85 for a mail order tune plus free tweaks from a respected mail order tuner.
Has anyone added all this **** up?
I did sell the motor, FM II turbo kit, rear end, trans, Motec ECU, full turboback exhaust, etc for probably $5K or so, so all in all it won't be a total money pit.
You can check out pics and progress at m.net in the conversion section. Just look for my thread about v8roadsters progress.