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Originally Posted by IBleedBlue
I went ahead and put the 50 series delta flows on my Mach and replaced the 40 series. Very satisfied. Cut down greatly on the interior resonance. Didn't feel much difference in performance except that I might have lost a little torque feel. Which is kind of interesting as you would think I would actually gain a little torque. Flowmaster web site bascially says not much difference in flow between the two but lot less noise.
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IBleedBlue, is your Mach a 5 speed or AOD? I really want a catted X, I think I can handle it with the 50 series I have now, but I have had this inside roar problem on mine (and on my Silverado, you should have heard it when I first put Flows on it) and I am on my 3rd set of Mufflers, I like it but I want a little bit more sound without getting the interior roar back.