what else to do

[MUSTANG_GT_98]

What else to do with about $700.
I hit a 13.5 pre headers and maf how much will this reduce my ets

 

[streetstang03]

nitrous, cams and a tune, or get some good suspension mods (subframes, UCAs/LCAs, springs etc...)

 

[artificial HP]

Save it for a PI swap