I love that pipe, I have it on my Savage SS. It makes a ton of low end power, but as Boutch mentioned, it is really loud. I happen to like the sound of it.
What are you kidding me? The HPI ribbed pipe makes serious torque. It is actually a great pipe unless you want top end speed. I have used this pipe on several different engines, and I would definitely recommend it for anyone looking for torque.
Have you actually used any of the pipes you are recommending?
The pipe choice really depends on what you want from the truck. If you want top end speed, don't get the ribbed pipe, the THS would be a better choice. If you want a low end torque monster, the ribbed pipe is a great choice.