exhausting question....haha

[tomahawk1976]

Got an 04 firebolt, po fabbed up a killer exhaust, but its WFO.....no muffler, no back pressure. Absolutely love the sound, but its robbing the hell out of the bottom end. Any suggestions to a good setup that's still loud as hell and won't kill my bottom end either?

 

[go cytocis]

...no back pressure. Absolutely love the sound, but its robbing the hell out of the bottom end...

I'm not a Fluid Dynamicist, but it's not the lack of back pressure that robs power. Indeed, the opposite is true. The real factor in how a pipe makes power is the velocity of exhaust gasses it shapes, which is a function of pipe diameter & length.

Having said that, there's a good comparison here.

 

[Cosworth]

Dean adams [up]

 

[Cooter]

+1[up]
I believe Dean has done more research specifically to Buells than anyone else. Dyno proven HP.

I like my Barkers, but I'm saving up!Keda Exhaust

 

[lawdog]

Did you tune it? Need to tune it the ECM to match the characteristics of the intake and exhaust.

 

[DSHUMAKER]

I'd say Dean Adams I got mine about a week ago and love it!!!

 

[jetlee]

As Go_Cytosis mentioned, it's not the loss of back pressure (any back pressure is bad) that affects your torque, it's the loss of velocity due to the larger diameter that inhibits the scavenging effect and lowers your bottom end torque output.

Larger diameter flows more for more pull up top. Smaller diameter increases the scavenging at the expense of total flow.

Dean has found the happy medium.