I love my flows and would not trade them for anything.

 

Im running 30series flows on my truck and nova. Just to see if they where hurting the nova, i pulled the exhaust off at the track. The only thing i picked up was mph. It went from 130.7 to 130.9 . Doesnt look like the hurt hp that much.

 

that chart doesnt seem correct to me. how can a turbo muff(borla xs) out flow a racing muff(borla xr1).

 

the reason I went with my Gibson is because I like the sound and no one at the track has them and the performance is great!

 

I agree.
I am running dual 40 series, and when I uncap the exhaust I only picked up 1 tenth of a sec. and 2 mph.
not much to worry about unless I was really serious about getting every once out.

 

I know when I got rid of my single in/dual out Flow40 and put the Hooker Aero Chambers on, I lost about a pound and a half of boost. That tells me those Hookers flow a LOT better than the Flow40.

 

As much as I loved the sound of two chamber Flows on my departed 69 Z/28, all the data I found says that all of the street Flowmaster mufflers do not flow as well as XR1's or Aerochambers. I put an Aerochamber on my 99 OBS Tahoe.

 

Hooker Aero Chambers? Someone mentioned that there is an Aero CHamber not made by Hooker. You got anything on this?

 

I have a 2000 Yukon XL w/ a 5.3L V-8. What should I use for the exhaust system. I have been told I can not put duals due to the location of the spare tire & gas tank. Does anyone have any suggestions.

 

Almost all the tests and charts I have seen are subjective and without detail. You can find comparisons and make them say what you want.

I have Flows on my Cheyenne--
Magnflows on my Chevelle--
Dynomax's on my Suburban--

I like the Flows on my 502 and would have them on my Chevelle but will be going back to 3-1/2" open tube dynomax race mufflers---magnaflows don't flow well enough and I could tell a difference.