i have TRD exhaust and a AEM intake, and that is the best intake/exhaust combo made i almost beat a stock Turbo VW Jetta the other night and i gotta GT, it was a really close race, i was ahead of him 75% of the time but towards the end he crept up on me slowly and took the win with his rear fender at my front fender. best place to start is intake, then get exhaust.
http://www.aempower.com