818EDGE Posted April 18, 2008 Report Share Posted April 18, 2008 So long as you don't remove the cats, you are fine. Back in the day, we used to hollow them out when removing them became too much of a hastle to pass visual. All the newer computer stuff would pick up an emission problem right away. They have o2 sensors before and after the cats to monitor how they are working. Remember too that some backpressure is good. Just because you get it loud doesn't mean its working better. Cat-Back is no problem!!! Quote Link to comment Share on other sites More sharing options...
bluesky636 Posted April 18, 2008 Report Share Posted April 18, 2008 That is really cool. I have dual Flowmasters on my 1964 Ford Galaxie 500 convertible with 390. My website is in my signature. My wife has been bugging me for Flowmasters on her 2003 Mercury Marauder. I think it sounds good as it is, and FLowmasters are notorious for their interior resonances. D0 you have any problems with that? In the Galaxie, with the top down and the FLows flowing, you can't hear the person next to you. Quote Link to comment Share on other sites More sharing options...
Lex Talionis Posted April 18, 2008 Report Share Posted April 18, 2008 FLowmasters are notorious for their interior resonances. D0 you have any problems with that? In the Galaxie, with the top down and the FLows flowing, you can't hear the person next to you. good to know as both of those are attributes I would not want Quote Link to comment Share on other sites More sharing options...
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