Some one told me that the spiral type bullet mufflers that a few companies make flow for crap. Is this true? Anybody have any numbers on this?

Thanks

 

I heard the same. I was told they were just for sound. If you look at the design you can see why its restrictive compared to a straight bullet or any other straight through muffler.

 

Lane, the guy I bought my true duals from said he's seen dyno tests of Flo Pro Twisters and Bullets, and they were the same. The Twisters may flow slightly less then Bullets, but it's not enough to show up on a dyno, much less on the street. If anyone tells you the Twisters flow poorly, they're just speculating.

Jason

 

Indeed. Also the spiral flows go out into the 4" case instead of just staying 3" inside, which gives them more area inside than a bullet.

 

Also, depending on who makes them they can vary.
I went to a local exhaust shop to get mine and he showed me several different ones. Some had HUGE louvers(sp?) in them. The ones I got had a 3" inner core but very tiny fingers sticking out. So they are almost a straight though.

 

Were talking about spiral flows, you're probably talking about a sweet thunder or something similar....

 

What about the Moroso Spriral Flows? I guess they are similar to a Twister.

 

Pretty much. They have a 1" open pipe that runs down the center with the baffles wrapped around it. Either way, neither the proflos or the spiral flows will be a restriction on the street.