Greddy Cat-Back exhaust

Well my buddy hooked me up with a cat back greddy exhaust for my 97 integra for free, and i know how to install it myself its as easy as unscrew the bolts and bolt on the new pipes.

I was able to get the axle part of the muffler off but the Greddy muffler wont fit on that pipe.
So i tried to get the curved pipe off but i cant get the stupid bolts off that are close to the catalyst! ive tried so damn hard i even pulled my trapezius muscles! i cant turn my neck now.

I just want to make sure that im doing everything ok, anyone have any tips?

i had a problem with exhaust bolts and nuts too. i used oil and let is sit to work itself in. i also used a hammer and mallet to help it out. just make sure not to hit anywhere you will dent the pipe. use a longer wrench, i used a torque wrench.