Any Suggestions on which Flowmaster (40, 50, 70 ) for 2000 Superduty 250 Ext Cab, SB?.....Thanks.

 

40... no matter what... sounds the best i think.

 

Thanks for the reply. I was leaning toward the 40 but was a little concerned with sound level in the cab at cruising and also with performance as Flowmaster only lists a 70 for the V10.

 

If you get the 40 series deltaflow and keep your stock piping you won't have hardly any interior resonance. Just a nice sound when you get on the gas. My dad has the same setup on his Superduty (except the 5.4) and it sounds great!!

 

FM40. I have surprisingly little drone in the cab under hwy speeds. Sounds wicked on a V10 at WOT. See my FTE site for the sound clip.