I Want My 2003 Gs 300 Spt Dsgn Faster! Pls Help

[nikkokan]

Hi to everyone who knows cars and how to make them perform better,

I bought my certified 03 gs300 sport about a year ago and Love the car and have determined to keep it rather than take a hit and trade it in. I want it faster, off the line and top speed, but of course need it to handle better to. Please offer the best suggestions so I can start pricing this out. I have 42,000 miles with a full warranty til 100k. I know toyota/lexus and unless you beat the crap out of them will long pass 100k miles w/o problems but I really like the security of the warranty. If I were to soup it up a bit for a better driving experience but had to service the engine/trans for some reason, could I take off all the mods and take it to the dealer as I bought it, or will they know???

Thanks,

Nikko