Ignition retarder for N2O

[mertdastan]

I will be using the NX Maximizer to control N2O flow. The Maximizer can also retard timing. Could someone recommend a device that can retard the ignition on the S50B32 (euro M3) engine? I need the exact part number of the retarder.

I can control ignition with the Unichip piggyback but when I ll spray N2O I do not want to retard timing with the LAPTOP each time. Instaead the PDA will do the job.