I recently put Sony 6 1/2" Xplod Speakers in the front kickpanels (factory location) of my S2 and S3 Spiders with no cutting etc... The fit was quite good. They sound great and no major hassle. In combo with a reasonable priced stereo it is quite excellent.I find they have a few seasonal sales when you can get pretty good gear cheap. Worked for me. Just FYI.