L Jam questions

[hopej]

For a small car, is the m20 Blinder good enough or do I need the m40. Can the m20 be converted to an m40 easily?

Does either the blinder or shifter false often?

[brick]

If you haven't seen the video:
http://www.radardetector.net/VEIL---Blinder-VS-Stalker-LZ1-GEN-III-11-May-05-1491t.php

Those all use the M20. All you need to do to make an M20 an M40 is buy extra jammer heads and plug them in.