alot of times the boss audio wiring kits are on the very low end of the guage recommended to run any subwoofers or amplifiers other than their own. they are notorious for rating super high power but only truly giving less than a fraction on what they say that perform at. always look at the rms values with amplifiers and that will be what they are really outputting not the max wattage.
with that said we have many options for you, but my personal recommendations would be to get with your local installer to inspect the wiring of the boss audio to make sure it will be compatible with any of the amps that we have in stock, you may be informed that it is too small of guage for what we carry, so just a heads up.
we can charge you our regular amp install 100 dollars and then we can warranty the work for a lifetime, but if you just want us to add onto what is already there, we do have custom labor charges, yes it will possibly save you money, but no warranty on the labor for custom labor charges (24.99 per 1/4 hour).
again i would swing into the shop that you are wanting this installed at to have them inspect and give you some options. best of luck!
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