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| 2004 to 2008 F-150 and Mark-LT 4.2L, 4.6L and 5.4L equipped F-150s and Mark-LTs. |
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#1
Sun, May 9th, 2010, 01:26 AM
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I'm not too sure the original question was answered, as I too, am wondering do I need to get a whole exhaust system, or can I swap out the muffler from stock and gain some type of benefit from the magnaflow? I understand the the tuner will be a great addition. Thanks in advance.
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#2
Sun, May 9th, 2010, 02:37 AM
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I got a very honest opinion from the guy who installed my Flowmaster:
Ford did a really good job on the exhaust system on the 2004+ F150s. He didn't think there was likely any HP gains to be had unless somebody went with a hi-flow cat, true-dual system, and then only a couple HP, at best. He thought there was only two good reasons to change the stock set-up: 1) because you want it to sound better, and/or 2) to save some weight by dropping out the behemoth stock muffler.
__________________
-- 2007 F150 XL, 4.6, Regular Cab, Gryphon Installed 2/2009 "voiding warranties since 1979" 
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#3
Sun, May 9th, 2010, 11:02 AM
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I agree with what sburn said...if there are any gains they are very low. The only reason I had another muffler put on was just for the sound.
And that stock muffler is a monster....
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Flowmaster 40, PHP Gryphon, AS 2" kit
Hybrid Mode
