Originally Posted by stevo4756

I'm not sure about gains , but I just installed art pipes on my nismo exhaust with the factory y pipe and it sounds like crap. Sounds like the art pipes are buzzing . my guess is the oem y pipe that sits after the art pipes is causing turbulence / backup since it's tiny compared to the art pipes. Probably going to spring for $150 Megan / manzo y pipe... Ughhh frustrated.

Originally Posted by lorentzoe45

So I ended up getting the z1 hfc, z1 intake manifold, and tune. That's paired with my k and n intake and y pipe back exhaust. They ran almost 20 runs and I topped out at 297rwhp on my 2011 g37x sedan. Keep in mind the car still has stock y pipe which I will be replacing but they tried all the y pipes they had at the shop and none of them would clear the transfer case. As far as sound believe it or not it got better. If I could do it all over again I would of got the stillen gen 3 intakes and a y pipe that fits awd before I went and got it tuned. I have before and after videos if someone could kindly let me know how to post them. Also z1 has dyno videos and pictures that they are emailing me today. Very pleased overall. I gained power in every rpm. Rev limiter at 7900 and that is one of the best things really really helps top end just that little bit.

Originally Posted by jfisher

What did Z1 end up tuning your car with? ECUtek? I'm assuming they found some way to disable the AWD? Pretty damn good numbers.

Originally Posted by NeoNz

Any word on the flowmasters 3" --> 2.5" midpipe install?