I have a catback exhaust exiting out the back and its not loud enough, I was wondering how loud would my truck be if i just changed out the borla exhaust and put in a glasspack? Does anyone know where to buy glasspacks at? Since i have a catback exhaust would i need to get the 1 in 2 out or just the straight muffler?

 

or would it make it louder if i got a pipe going through my muffler and just made it look like the muffler is working but the pipe just goes right through it

 

Borlas are quiet, so yes, glasspacks would be louder. The borlas that I've examined have a lazy S shaped internal pipe that would eliminate the possibility of slipping a pipe through them. As with most straight-through design mufflers, length and case size will dictate sound level. I would skip "old school" mild steel glasspacks and stick with stainless steel products. IMO, for a loud, throaty sound, a better alternative would be a short, SS Dynomax Ultraflow. Maybe you could sell the Borla muffler to a member here that wants a quality, quiet muffler.

 

So an SS Dynomax Ultraflow would be louder? Where can I find one at?

 

Yes, Borlas are quiet and Ultraflows are loud. They have a throaty, muscular sound like a Z-28 or Mustang on steroids. With the factory multi-cat setup in place, you have to get an extremely loud muffler to get a mean rumble. You need the smallest case (less packing), in the shortest length, in your pipe size of choice. You can read up on them here:

http://www.dynomax.com/ultrafloss.stm
http://www.dynomax.com/documents/ultrafloss_specs.pdf

...and buy them here:

http://www.a-1performance.com/
http://www.a-1performance.com/ultra_...lers/index.htm
http://www.a-1parts.com/performance_...TEEL%20MUFFLER

 

I recently put Dynomax glasspacks w/ a Magnaflow x-pipe on & it sounds pretty good. It's got a deep growl to it but not obnoxiusly loud all the time. I went throught Jeg's they were pretty reasonable. Product + install = about $250. Good luck.