Ok, so my old Ford is straight piped, factory ats turbo, and I want to make the turbo really whistle, any ideas?

 

You can pull off the intake tube and see if it has a silencer ring like on the dodge turbo's. If it does,remove the snap ring and pull the ring out.

 

Or get some white sunglasses those add 50hp and make turbos whistle big time.

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Sorry that was mean trust me your turbo is makin noise it just makes it out the back. Remember newer diesels have bigger turbos bigger exhausts and put out a greater volume of exhaust and all that makes a turbo sound good. Really if you want whistle get a different turbo