If I were you I would only put one of those subs in for a few reasons.
One if your going to a smaller car your are going to get more bass from just one than you did from two in a bigger car.
Also you will not have to work your amp as hard their by not straining you alternator as much because your gain "amp volume knob" will be turned down.
Get a rear firing for better sound and louder bass.
Also use the 6 1/2 only if they are components which means there is a tweeter and a crossover which is a small box that should be labeled something like "input" "tweeter" Woofer" If a tweeter is on the speaker they are coaxial's and you should get new speakers that are components. I recommend that you also run new wire from your amp to your speakers as well for better sound.
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