Stillen headers have shown no gains or very low gains - lot of effort for minimal results. Personally, after a lot of research on this, I'd stick with either the Z1 headers, or go long tube headers. So the bad news is, if you're considering headers, you're probably going to get rid of your existing HFCs/TPs.
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2014 370z Touring Sport Magma Red MT // BP Single Turbo 6467 // 63mm TB's // Z1 Ported Upper Mani // RJM Pedal // Zspeed Stage 3 Clutch // 526 WHP, 451 WTQ
2006 350z (Sold) // 1990 300zx (Sold) // 1985 300zx 2+2 (Sold)
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