thanks for the replies, its not annoying to hear it backfire, cause i sometimes like to hear it, specially on my friends v8 lol.. i was just worried if it should be doing that allot... btw, whats is VA? the only one thing thats annoying me is the sound is resonating alot on the inside... its enough to hurt my ears and i think its not supposed to be that loud inside? so what it is is a stock tubing from the cat to the end which is at the rear wheels. i then welded a 2 inch pipe to the muffler and put a coupler from 2 to 1-3/4 inch and just clamped it down...

thanks