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Unfortunately, the above is correct, except for one major improvement for the 5.9. There's now an M-1 manifold available. It's a radical but permanent repair. You replace the stock manifold with what's basically an aluminum "old school" style manifold so no more belly pan gasket to blow out. It also provides a better power band and throttle response with a tune of your PCM to give more hp and power. Still not CA smog legal (if you have a very smart and unbending inspector) but it won't really change the numbers out the exhaust for the sniffer. Expensive, but fun. It uses a stock TB or you can go to "The Fastman" and get a re-sized one for better airflow that can't be distinguished from stock (it's a stock TB with larger bores.)

Mod fever is a contagious and wonderful thing. wahaha!
 
His garage is as big as my house.
 
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