The 98-02 L36 GP's are easiest for this swap, since there's less security/etc. BS than the Buick's/Chevy's, but those are also fairly straight forward.
An N/A harness & pcm can be re-used, with slight modification. The harness just needs the MAP sensor (BBV solenoid is unnecessary babysitting, most heavy modders pull this and turn off the DTC anyway). For the pcm, best option is to upload the L67 version of the same year car (i.e.: '98 GTP file for a top-swapped '98 GT). Since tuning will be necessary for proper running afterwards, this doesn't add much time to the work.
The 2-bar conversion to a GT/L36 file isn't reliable, since the N/A pcm file still trys using the maximum MAP reading as its barometer... resulting in cruise fueling issues after going into boost. This is why you either tune an L36 pcm to still run a 1-bar MAP, or convert to an L67 pcm to run the 2-bar (only real difference is that you get to see boost values in the scans).
- Dave
