Depends on the vehicle I have found out that a Blinder M45 with 2 heads front and 2 heads rear is enough to cover a small car like a honda civic
[ame=http://www.youtube.com/watch?v=pSxjZE_l1TQ]YouTube - Blinder M45 laser jammer on Honda Civic VS. Laser Atlanta SpeedLaser2[/ame]
Blinder M47 might be enough to cover the front and rear of midsize to large sedan but the only way to know is get your set-up tested
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