1998 GT

I have a 1998 auto GT. I did some quater runs when i first got it and it ran a 15.2..
I have recently installed 4.10 gears, full pi swap, ported tb, longtubes-no cats to super 40's, bbk CAI. I am also going to spray 100 shot. I am wanting to know of anyone has done thos and got a estimated hp and tq rating and quarter time. W/O nitrous and w/ nitrous.

Also i and needing a x-pipe because i heard they help better than h pipes. I still have stock one, suggestion on keeping it or x?

Id like some suggestions on what else can get some power out of the stang. Any ideas are welcomed.

i seen a few places test them and i kept hearing x gives a raspy tone and h or more muscle. Any ideas on what brand or does it matter? also do i need a shorty pipe because im doing longtubes?