heres my 06 5.4

 

Not too bad there sounds aggressive.

 

Its the short muffler....(either a 10 or 30 series si do) with 2.25 from the muffler back but its either 3.5 or 3 from the y back

 

sounds good, probably the 10 series which i have true dualed and its probably 3" inlet because 3.5" would be killer

 

Flowmaster has never made a SI/DO 10 series or 30 series race.

 

Sounds good. How do you not know what it is?

 

That kind of stuff confuses me sometimes too lol. The part # for the muffler is on the back side where the outlets are, you need to look sharply because its etched into the steel real finely.

Example on one of my Super 44s


Its a good thing those Flowmasters sound good, because god they are real ugly, and will rot away