how to do hair trick

[Budah93 7]

i have 2 15" Sundown sa-15's in a 7 cuft box in a 1998 gmc jimmy. i'm running a hifonics hifi1500.1 amp. I've seen people with the same subs, same brand amp(but smaller) in very similar vehicles do much better hair tricks than i can achieve. Any suggestions on how to increase mine? I love to show off my subs and this is a fun way to do so!

[EPerez 236]

I know that low tuning helps a lot.

[ricksi30 923]

What are your enclosure specs?

[bhsdriller 24]

beat me to it...what's your box like

[Budah93 7]

7 cuft tuned to 35 hz

[ricksi30 923]

7 cuft tuned to 35 hz

Port area?