Which would sound better highflow cat or removing cat and straight piping it. Would there be a torque loss by running no cat? Please Let me know the pros and cons of both.

 

You could lose some torque and hp but the biggest thing that will take a hit is fuel economy

 

Thanks for the reply, I kinda thought that my mpg might drop. But why is mpg decreased when guys do this to these trucks?

 

You'll have to deal with the rear o2 sensor issue you create when you have no cat. I'd suggest an aftermarket cat with a dual catback exhaust. You can get plenty loud by the muffler you choose, although I'd recommend middle of the road - really loud gets annoying to both you driving it and your neighbors witnessing you drive it. I've been using AP stuff for a while. Good stuff, great pricing.

http://www.apemissions.com/catalog_t...mance-exhaust/

 

BTW the AP cat back tailpipes are mandrel bent, super smooth and fit pretty good. I bought a stainless muffler, front extension pipe, two tails and all the clamps for $183 shipped - a couple years ago. I ended up getting a different front extension pipe because the PO had screwed up the pipe in front - so I just cut his mess off and welded the longer pipe on. Good luck !