I'm running the Z1 Plenum & I can't tell cause I installed the Stillen G3, Motordyne ART pipes, Motordyne Shockwave (E370) the 34 row oil cooler, and then had it UpRev Tuned. I'm getting 319 to the wheels after my dyno. The stock headers are actually pretty good. Get the Motordyne stuff and the tune & if you go with the Z1 plenum, have it port matched with the bottom manifold & bore the throttle bodies out as well, I know the guy who is getting them done for everybody got some good gains. We have collectors cars bro, 2016 is the last year of the 370, & I've already had the Nissan Dealership call me several times ( and I got 3 letters, the last one said 15% above Blue Book value if they could buy it from me. Hell no, I got it I'm March of 2014 in a private sale for $23,900 ( no tax in AZ ) and it's the Coupe/Premium with every possible option except Nav, it's a 2009 7AT with 22k miles when I got it last year ( close to 30k now)- have the original window sticker and purchase paperwork, total was over $45k. I love my Z , will never sell it. Sorry for the long post, just thought I'd let you know what I got out of my mods & that the Z car is a wanted car now, A LOT of owners have gotten letters and calls to sell it to the dealership.
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Stillen G3's - MotorDyne E370z CBE - MotorDyne ART V3 pipes - Z1 ported intake manifold - Z1 (34) row oil cooler - Zspeed V2 undershroud - 318 WHP (dynapack) 260 TQ after UpRev tuning by XactDyno here in Phoenix -
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