Big deal is you need to drive the vehicle around for a long while, freeway run is good... to get the cat to work properly. This goes along with a proper tune on the said motor.

I don't have a precat on my F150 anymore, just a single highflow unit... works fine provided I drive it to where it's quite warm. Simple city driving will not work.

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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]