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i have the LH-jet up and running( useing 1986 volvo 240 system) but a question, i am useing the throttle body off a 9000 model.. part no 3560.. i think it's from a 86 saab( the motor was not transverse) i have noticed looking inside the t/b that there is a step before and after the t/b butterfly( throttle plate) is this here for a reason, or could it be shaped for better air flow.. as in smoothing out the step? thanks