I dont think it will to be honest.....much better off getting a decent set of 6.5" splits and run them off an amp with 100wrms+ per channel.
When you consider the cost and time needed to build a set of custom pods to suit 6x9s, it will be easier (and cheaper) to upgrade the current splits. The Jaycars (i assume theyre Jaycars?) are a nice set, but for $300-$400 you could get better results with splits.
By all means, go for it.....obviously its your car and you can do whatever you want, this is just my opinion