Do you have any idea what that red hose is for? Where do you think is a good place to start as far as aftermarket part upgrades?

 

Can't remember right off hand, might be the coming from the wastegate or turbo. I'll have to check on that. You have many aftermarket parts, you can start from modern performance or just google it. You'll just have to shop around, craiglist and ebays are sometimes not too bad.