I assume it is the 2-door? I've looked at all the speaker options for that year, don't see where you can put 4x6's in the dash, 2.75" looks to be the largest even if the grill looks like it will accommodate a larger speaker. That factory HU is fine, as a HU it outputs around 21 watts per channel.
Recoil has a pretty decent four channel that will work with that HU and the power will help a LOT.
Class D 4-Channel Amplifier, 1040 Watts Max Power, RMS 130 Watts x 4 Channels@2 Ohm; RMS 80 Watts x 4@4Ohm; RMS (Bridged): 260 Watts x 2@4Ohm; Peak Power: 260 Watts x 4@2Ohm Featuring a high-speed MOSFET power supply, premium-grade internal components, as well as 4-way protection circuitry, the...
www.recoilaudio.com
This for a single amp
This if you plan on an additional amp for a sub
Some great buys on Subs and amps too.
One of these
Product Details: 12" VS-Series Version 2 Dual 2-ohm Car Subwoofer Power Handling: RMS: 450 - 600 watts Aluminum Shorting Ring to prevent rises in inductance Non-Pressed Paper cone High Roll Custom Blended Foam surround Stamped Steel basket Single Nomex Spider 100oz Y30 High Energy Ferrite Magnet...
nvx.com
In one of these