Removed cats

So today i went to the parts store and got some of the 2 1/2" flex pipe, only because my friends all said its what they use and works great, i didnt get started untill almost dark so i had to rush, thing is, i got it all on but had a few leaks that will be easy to fix tomorrow, the prob is that when driving it gets extremely loud under acceleration >especially at 2500rpm< i love the sound but its a little too loud for my likes and was wondering if this could just by a symptom of the leaks? any help guys?

man order you a set of longtubes 269 right now thru tsp!!! If you come to us we can install them with a offroad y pipe abd will sound way better... if you like ut semi loud we have small 4x6x8 3" si/so we could throw on after the y pipe and it will sound bad to the bone!
http://www.youtube.com/watch?v=kzYac...e_gdata_player
with that muffler
http://www.autoaccessoriesgarage.com.../2474_1_lg.jpg
The smaller muffler but its round not oval...

Just heard chevrolades truck on youtube, im guessing without cats the 22in magnaflow will get rid of all the rasp, his sounds alot like my father in laws 2010 camaro ss with the magnaflow cat back system, chevrolade if you read this, man your truck sounds sick!! lol..