4" is raspy... 5" straight will rattle your teeth loose trust... I don't know how anyone can hack that... I did for about 6 hours and had a muffler on order...

 

i did it for a year and buddy has it now for a year and a half

 

Your a brave man!!

 

I lasted about the same amount of time as luvn did. had a 24" long 5"in/5"out resonator, removed that when i did the stacks and OMG. called my buddy who owns an exhaust shop and told him i was on the way. pulled into the bay and 30minutes later had the resonator installed and sounds sweet now. I can actually hear myself think.

 

3rd gens sound like junk no matter what exhaust size untill you put a 2nd gen exhaust manifold on them

 

i have an 06 with the stock pipe on there. i ran into a lotta trouble when i tried to get my straight pipes passed in the inspection but it only took a few exrtra bucks to pass it. and no, straight pipes on the 4" do not sound bad at all, its lloud enough for me

 

my old 5" systemt was loud even with a free flowing muffler. when i switched to my 4" silverline to 5" stacks it got super loud. already got in trouble with cops for having it but they let me go because they thought it was cool that they heard me from 3 blocks away. i personally like the sound but it is a tad loud for in town driving.

oh and i majorly disagree with the guy who says 3rd gens sound like crap

 

you just got to get the right set up and they sound real good IMO

 

i dont knwo if i have a 2nd gen or a 3rd gen but right now im running a straight pipe with an 8 in tip. and i think it sounds good. im bout to put my stacks on found a good deal from a buddy here local

 

Stock 3rd gen w/ 5" straight pipe on dyno run
http://video.google.com/videoplay?docid=-7002416358672946157&hl=en
4" w/ muffler & smarty on 5 @ idle
http://video.google.com/videoplay?docid=5886950071547402937&hl=en
5" straight pipe w/ Smarty on 5 on dyno run
http://video.google.com/videoplay?docid=3136392767149891211&q&hl=en
We've done almost everything from stock to 5" straight pipe w/ a side dump. I'm happiest w/o the muffler and every time he puts one on the truck I make him cut it back out.