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Q:will this be compatible on an 2007 lexus is250?
A:This MSD Ignition 6AL-2, with 2-Step Limiter, 4,6,8Cy -part# 6421 is universal and not a direct fit for your 2007 Lexus IS 250. MSD Ignition Multiple Spark Discharge Ignition Controller with Built-in Rev Limiter is a new ignition control that combines a new housing, new digital controls and more power in a sleek package. Inside the new cast aluminum housing you'll find an advanced micro-controller that manages the timing and rpm of the ignition. The spark output of the new box has been turned up to 535 volts of primary voltage with spark energy reaching up to 135millijoules. The multiple sparks of the 6AL-2 burn in the cylinder for 20 degrees of crankshaft rotation to ensure complete combustion. There are two rev limiters, one for high end protection and another you can activate off a clutch or transbrake to set a launch limit. This feature will help your car blast off the starting line. Adjustments are made via four rotary dials for 100 rpm increment control. The all new capacitive discharge ignition will easily connect to nearly any 12 volt negative ground distributor system. For any further assistance, please visit your nearest Advance Auto store or call us directly at 1-877-ADVANCE (238-2623) and one of our representatives there would be more than happy to assist you.