I have a 1997 F150 ExtCab 5.4L! I have purchased a 40 series Flowmaster 1 in 2 out muffler! I have also purchased 2 18.5"x3.5" tips! My ? is yes cats or no cats? I do not want it extremely loud I want it like a good sounding Stang! I want this race rumble not the 4x4 monster truck sound! Thanks much appreciate all replys!

 

If you want a good sound without paying alot or messing with your cats, cut tthe factory muffler out and have a Y pipe made with dual tips -or- cut the Y by the motor and run true duals out the back with no mufflers. If you leave the stock cats in place, it wont be ear-shattering loud, just a great sound (thats what i have now on my truck)
If you take off the cats and run flowmasters or straights, it WILL be loud! Personally, it will sound better with stock cats and straight pipe if you dont want an enormous sound. However if your like me, if the state inspections allowed, Id have no cats and true dual straights out the back!

 

I appreciate info the only problem I have with it is that I have already purchased Flowmaster 40 series 1 in 2 out! If I remove 1 cat and add Flowmaster with dual out will I get good sound? Thanks

 

yea youd get good sound, but not as good as straightpipes