Arizona Speed and Marine has put together power packages for some of the most popular Mercruiser engines. These packages are comprised of high quality components that have been tested to increase the performance of your boat. 454/502 Mag and HP500 Super Tune Kit $1,165.00 Mercury 575 SCI Boost Kit $1,075.00 If you don't see what you're looking for please call or e-mail us. Phone: (480) 753-0208 Fax: (480) 753-0216 Hours: 8am - 5pm M-F Mountain Standard Time