2.5 Tech 4 Upgrades.. are there any????

Hello once again people.
Maybe somebody here can lead me in the right direction. Is there a web-site or company that makes engine upgrades or performance parts for the cutlass 2.5 tech 4 inline 4 cylinder engine?????? Much much thanks if u can help..... I checked out mantapart.com, but they specialize in the quad4 and v-6 engines......thanks.

Just as a heads up. Avoid manta!! Back when I owned a sunfire I looked into this company and heard nothing but head aches.

The only upgrade you should concern yourself with this engine are some prayers and good maintenance to keep it running.