I'm debating on rather I should get aftermarket amp(s) or sub first for my 2IS. Only have the money to do one or the other right now. I feel like aftermarket amp(s) would help improve the base and sound quality a lot. I already have a sub and mono amp though, so it would be cheaper to install. If I get aftermarket amp(s). I was thinking of getting two 5 channel amps since the OEM amp is 10 channel. Please feel free to share your opinions! Thanks!

 

Do the woofers. If you really can't wait to do both at once, I'd remove the stock sub to port into the cabin, and wire up a new sub in a separate enclosure. You can buy 12" subs in an enclosure with an amp for $249 at best buy and the things THUMP if you're looking for an affordable temporary solution. LOC from rear door speakers, remote turn on tap and power to your new amp... off you go!