hey,
i have a 98 mustang gt without the mach 460 system. i looked in the trunk to see what the rear speakers and they were 6 by 8 very seurprising before i take anything apart i was wondering if you could fit 6 by 9 in back???
I would just say screw the speaker holes and rather make some wooden boxes or if your good with fiber glass make something to fit the trunk and get some round speakers. round speakers are better for sound quality. thats what i did but im going to make some fiber glass boxes in the front where my kickpanels are for soem six inch speakers.
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1986 Mustang LX 3.8l- Blown Engine and Sold
1990 Mustang LX 2.3l- Totaled (Rust in peace)
1998 Escort ZX2 2.0l- Totaled (Rust in peace)
2000 Escort ZX2 S/R 2.0l- B&M short throw shifter, Borla Muffler, Iceman Intake, Centerforce Dual Friction clutch, Visteon PCM CWQ3 (Oct 91+), Tokico Struts, Energy suspension bushings, Eibach Lowering Springs. (all from factory)
i took the easy way out and got two mach 460 rear amps off ebay for 30 bucks:thumbsup good deal. and bought some 6/8 keenwoods. the sounds pretty good. last of the interior mods time to save up to gain some extra hp.
6 by 9 speakers in rear?????? 
before i take anything apart i was wondering if you could fit 6 by 9 in back???
