If im not mistaken, dumps remove some of the backpressure from the exhaust system, which can actually hurt your bottom end power. I think it helps you make power once you get up in the rpms, but for most people it may actually hurt power.


Here's a pic of my hidden tails:

 

I increased the throttle response greatly throughout the rpm range. You can always add the tail pipes if you don't like the dumps....

 

Dont forget the dust it creates. Plus it really makes people behind you angry because you sling dust all over them as well.

 

I thought this is what turn- downs are. Do you refer to turn downs as stopping before the rear axle?

 

I tend to avoid dirt streets.

I do like to find short convertibles in my '65 F250...the exhaust exits horizontal in front of the rear wheels...from a 13:1 CR engine. (just haven't got around to putting tips on it yet to divert the flow)