I have had the lil beast (2005 21,000 miles convertible) a few weeks now, and am enjoying the driveability of this car, and it feels like a luxury car after the 94. But, lets say I wanted to bump it up to say about 640-650 ponies... It is 11 years old, looks new.. and I want to keep its dependability, not looking to go crazy. The engine seems to be a great platform to add power, and maintain the engines longevity, reliability. So for reliability, dependability, and 150 more hp, your experienced recommendations???