i found this on ebay.. do i need any mod if i get 4 speakers two front and two back since they both 6.5" here it spec
is it gonna sound good?

Infinity kappa 62.7i
2-way speakers
2 Ohms
Edge-driven mrtal matrix diaphragm cone with + 1 sizing
hi-roll butyl rubber surround
cast-polymer speaker basket
computer-optized 18 dB / octave outboard crossover
3/4" M.M.D. tweeter
Frequency Response 45-25K Hz
Recommended Power Range 75 watts RMS
Peak Power Handling 225watts
Sensitivity 95dB

 

From the 3G TL Audio & Electronics FAQ:The threads above will give you the specs of the speakers that will work. There are more threads in the FAQ for you to pull additional information from. You might also want to try a search. Good luck!