catalytic converter.
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Joined: Dec 2003
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From: South Texas Coast
Originally Posted by strokin_it7.3
the OBS's downpipe is very restricted, not much room between the firewall and the other parts. so they had to smash the pipe down so it would fit. a 3 or 4'' down pipe requires some firewall bulging. but the muffler is better then the new body style. OBS= bad downpipe and better muffler, NBS= good down pipe and poor muffler. they couldnt get it right.
I did it on mine.
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Joined: Aug 2005
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That's makes sense in light of the cat being there in the first place. Probably a california law. Would I have to "modify" the firewall to install the new down pipe? You mentioned bulging it. Also, would this flip chip help w/mileage and safe for a truck with as many miles as I have?
