Norty, as a dealer for JL audio I can recommend a few things to do.
1) Make sure you upgrade the electrical system (alternator, battery, and cables from alternator to battery and ground)
2) W7's are a sound quality sub, however, they can be very loud as well. Make sure if you are going for loud to have a ported box built EXACTLY to JL's specs. (they are picky)
3) Dynamat the hell out of your trunk and rear deck (helps dramatically with the LS)
4) Call JL audio's tech line to get tuning recommendations for the amps (some installers just do NOT know what the hell they are doing)
Follow these steps and I guarantee you will not be disappointed with the W7s