Adding a needle valve to your boost controller installation, will allow you to tune the rate of rise for the boost. So while the boost controller limits boost and reduces oscillation, the needle valve allows you to tune the vehicle for the best drive-ability. Not sure? Get your boost controller installed and you can always add the needle valve later (although you'll get greasy twice).
Our Nissan Patrol needle valves have metal core components, surrounded by a high temperature composite and are very rugged. Each valve has 10 turns of adjustment and has an integral locking ring (that's the red thing--push it down to lock).