installed my equal lengths, have a question!

i just installed my BBK equal length headers today! they werent too bad to install, i had to turn into the HULK and put in my passenger side one but i got it in without damaging anything. here is the question:

when i rev the engine up, i hear this PSSSS noise for a second and it goes away. i dont hear it when i drive around. could it be an exhaust leak? i ran the car for about 5-10 mins (while i cleaned up my garage) and i did not hear any exhaust leaks.

one mod i did that i think it could be is my smog pump making that noise. i removed the pipe that ran to my H pipe and i made a mini-dump out of a hose and dumped it 2 inches down from the air outlet on the smog pump. then i took the other piece and routed it in a closed loop. could that be the little PSSS noise i hear?

i feel a bit of a power increase with these headers! i need to tighten down my passenger side engine mount bolt first, the engine shakes pretty bad when i start. i took it off so i can put my header in but later i realized i didnt need to LOL!

so right now, my exhaust looks like this:
BBK Equals + stock H-pipe (will go to 2 cat X pipe soon), dumped spintechs 2 1/2"

well, my air line was cut off and closed when my friend installed the off road H-pipes. it hasnt been in use in many years. i am temporarily using my stock H pipe till my dad ships me my X pipe which ill have next week.

just imagine the air tube coming from the smog pump removed and a little tube shaped like an L pointing downwards 2 inches dumping air to the ground.