the rsx and murano used the same spare tire sub. i have one. they're going for around $75 on ebay. 1. it's a bose product, 2. it's got dual 5" drivers in a ported enclosure.
i haven't hooked mine up yet, got it mostly for the novelty. i know going into it that it's going to be best suited for soft listening volumes of classical/rock/country.
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Howaitoguru
preventing speakers from blowing is all about the tuning of the system, not exactly the gear chosen.
with the rubber mat in the trunk, the sub is going to have a hard time breathing, usually when a sub takes the place of the spare, they cover it with speaker grille fabric so the sub can push air around the trunk.
if you're looking to hit hard, be sure to include sound dampening in the overall build-- the trunk lid needs it at a minimum, i had to do the rear deck as well. account for around $100 for material for that.
for the sub, you like the w6, so while i've got plenty of oddball recommendations, it looks like it should fit fine yet in this box at least according to the airspace requirements:
https://shop.wickedcas.com/scion-fr-...ab-description
though you'd need to contact them to be sure that the depth would not be an issue, as it's not listed in the description. $375 is on par for fiberglass work.
of course, a spare tire box would also be a possibility. the difference being that if you go with the link, if you decide 1 is not enough, it's easier to add a second to the other side at any point down the road.
i think it's fair to budget around $300-400 for a custom box of either design.
as far as the amp, i recommend the alpine v9. i generally go through sonic electronix, as they offer their own warranty to guarantee that it'll work, despite them not being a certified alpine reseller-- which means they can sell it cheaper--usually around $400-460 compared to $800-ish from a normal reseller. price-wise the v9 is one of the better-priced 100x4 + 500x1 amps from any brand. i was just researching an amp for my truck build and couldn't find a better cost-per-watt amp from anyone else at the moment.
i would also recommend one of these to tune the system.
https://www.parts-express.com/dayton...audio--230-500
i've currently got one on order for my truck build, as i'm running into an issue where the deck won't cross over the a-pillar speakers any higher than 200hz, and they start buzzing with any frequencies under 600hz
another important note is to look specifically for OFC, Oxygen Free Copper wiring. CCA or Copper Clad Aluminum is starting to become the norm, but it has issues at high power levels with heating up. i generally recommend knuconcepts kolosses flex line, for it's consistent quality.
http://www.knukonceptz.com/mobile-au...tallation-kit/
and that's just the sub/amp/wiring. still not a main deck, or front speakers. my rough tally puts the cost(depending on reseller deals) for this alone around $1700.
for front speakers, i highly recommend you try some different component speakers at the local shops. for instance, i generally find kenwoods to 'exist'. they don't play extremely loud usually, but they also don't call attention to themselves.
https://www.sonicelectronix.com/item...FC-P710PS.html
then there's component speakers like the infinity reference. i love the midrange response of them, always have, but i have a special hatred for the tweeters they use. i find them much too shrill. but many people like the sound infinities offer.
https://www.sonicelectronix.com/item...FC-P710PS.html
pioneer also has a few offerings in the same price bracket that might be worth considering.
i would not recommend spending more than $200 for a front component set. they don't upgrade the electronics in the higher end versions, they only use more exotic speaker materials, so unless you're into bragging rights about what things are made of, there's no point.
i also don't really see a point to recommending anything for the rear speakers, as those are really just very basic 3" speakers loosely attached to a bracket, so not as much is gained by spending money on them. personally, i haven't run rear speakers in 10 years now, and i don't miss them. in a car with rear 6x9's, it would be justifiable to replace them, but not in the case of these cars.
for a more 'oddball' setup, i recommend some gear that i'm running:
in the dash:
https://www.parts-express.com/dayton...8-ohm--295-349
in the doors:
https://www.parts-express.com/peerle...ofer--264-1092
with the v9 amp, i don't believe i've ever had the volume above 30(goes up to 62 on my radio)