Had my magnaflow si/so 18" muffler put on yesterday and sit sounds SWEET. Had an 18" tip put on as well, both stainless. Would do it again. Maybe its in my head or maybe after 1200 miles the engine is breaking in, but I definately feel a little more oomph.

tj

 

I had a Flowmaster si/do muffler put on right before Christmas and after approximately 1,000 miles, I definitely feel a difference. A friend of mine told me the muffler takes some time to “break in” and it will get louder. Well, I have noticed it is louder than the day I brought it home and my wife has noticed as well!!!

 

tj4ndirish,
What truck did you put the magnaflow on. I'm thinking about doing the same to my 04 F150 5.4

also does the 18in. tip look good on the stock piping coming out