they are sequential turbo's, custom tunes are returning fairly little gains without mods. but with exhaust and a few other tweeks, tuning (most are using a COBB accessport generic tune or getting them custom tuned by companies like forged) can return really good numbers, just as with any turbocharged car.
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Patrick // 06 Frontier 6spd Nism osis // Mods: Uprev Tuned @ Z1 Motorsports: 257whp & 292 ft lbs
09 Pontiac G8 GXP // M6 // Sunroof // Tint... For now
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