What is louder at idle an Ultra Flow or a Hooker muffler ? Does the ultra flow come in a dual outlet design or is it single only ?

 

Both are very quiet at idle(Hooker might be a bit louder). If you want a somewhat loud idle, Flowmaster would do the trick(if you don't care too much about flow).

Mike

2002 M6 Z28

 

Flowmaster still out flows stock by a very large margin.

Ultra flo isn't in the same category as a Flowmaster. They are "strait through" style muffler. The only thing that flows the same or better is the SLP mufflers.

Magnaflow, Flowmaster and Turbo styles all have around the same flow.

 

Hooker Aero Chamber Muffler p/n 520-21721 in Jeg's catalog $80 I have the Hooker cat-back..same muffler...sounds awesome.