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Ford Engine & Exhaust Performance All EFI, 4.6, 5.4 Triton

what muffler should I run??

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Old 05-18-2010, 09:46 PM
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wish that was the case. I use the cruse controll as much as possible expecally when traveling, My speed fluchates way to much if not..
Old 05-18-2010, 11:26 PM
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Originally Posted by honeycutt.dewey
if they're broken or plugged up, absolutely i've never experienced a situation where low back-pressure caused you to lose gas mileage. how's it running? any misfires? vibration, etc?
seems to be running fine. No misfires or vibrations that I have noticed. How do you check to see if your cat is plugged up?
Old 05-18-2010, 11:32 PM
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unfortunately, the only way to see if they're broken is to check for codes or cut them off and look... if they're broken, you can take a rubber mallet and tap the outside casing very lightly. you'll hear a distinct rattle if the catalyst is shattered.
Old 05-20-2010, 04:12 AM
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these triton motors are partial to back pressure, you have to leave the exhaust 2.5 inch diameter if you run true duals (until you get over 600rwhp) or a 3 inch single
Old 05-20-2010, 06:10 PM
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I am pretty sure that it is 3" all the way back. I didn't change any of that just had the muffler shop put a high flow muffler on it to open it up a little more. Should I go back to the stock?
Old 05-23-2010, 07:31 PM
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I think that I got it figured out.. i ran Premium gas in it all weekend and the tank that I ran home on didn't have any ethonal in it. Got 15.46 MPG...Think that that maybe the Problem...Hopefully
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