What is the
#3
haha not free but under ehh 250.$ and i have 4 subs in my trunk 2 different boxes i should take one set out ehh.. ;p
#7
take out a sub box, make a ram air system with boxes in your lower grill and tubing running to a sealed air intake box, do a u bend delete, turn off trac control (it cuts power to cylinders to keep you planted), mill the heads (increases compression ratio), if you mill do a full port and polish. all those are cheap but the mill that will blow all your 250.