How to improve my car audio?

if you don't want that Boomy crap ya don't need twin 10's just go with a 8" and at least a 100 watt amp to drive it heck save some more money run a 50 watt amp and bridge it to 100 mono keep the 6x9's run a 100 watt amp to them too if they'll handle it Low p the 8 at about 1K Hz if not a little lower. A rule of thumb is that 100 watts will drowned out hiway road noise.