Installed my 4 inch Rockford Fosgate fronts today. The speaker although 4 inch is much bigger, in terms of cone area and depth. Surprisingly the mounting holes match up to the RF's due to the basket design. I had to grind away some of the plastic to ensure there was sufficient room for cone excursion.
Although they stick out further once attached the door panel went back on no problem. Windows etc all function fine.
Sound is much better, but I have yet to connect these to the amp, they are still running off the HU.
Even if you dont install amps etc - these speaker fit and sound much better than stock speakers. they cost around 55 a set.
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