| This one: ______________________________________________________________ The only good reason to go to 720's is if you're planning on making a lot more horsepower than people normally make with upgraded turbos (i.e. more than 600rwhp, as NV said). 555's are fine for anything below that. So, unless you're going to be doing a TD-05 kit upgrade or bigger for turbos, I would stick with the 555's. Even then, a lot of people use the 555's with the TD-05's without problem. They idle smoother and are more fuel efficient because of the lower pintle mass. Although the 720's idle just fine, they still are not as smooth as 555's. source: [ http://www.twinturbo.net/nissan/300zx/forums/technical/view/608023/No-its-true--The-only-good-reason-to-go-to-720s.html ]
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