Then you didn't plan right. The right converter will make more of a difference then a ton of the stupid little **** people spend money on.
And seriously. On something so important leave the car apart that little extra time and save till you get it. Hell that's what I do. I can't afford to just go buy everything in a day. I pick up ot at work if I can. Sell some stuff and play the waiting game till it's done right. Why spend the time and money twice? That's just stupid.