350Z HR Y-pipe installed on a 2003 G35
#601
Yeah, I was thinking the smaller piping was to increase back pressure which in theory should increase low end torque, which makes sense. It also seems the longer down tubes help the revs under load.
I started the car up again before I left for work and it surely did sound more like the first gen coupe when you blip he throttle.....
I started the car up again before I left for work and it surely did sound more like the first gen coupe when you blip he throttle.....
I'm still not completely sold on the idea of running smaller pipes. MD did all sorts of testing during the XYZ pipe design and concluded running slightly larger piping was ideal. The 07/08 350Z y-pipe has fractionally larger piping than the DE y-pipe. There has to be a reason why Nissan choose to go with smaller piping on the G37/370Z y-pipes. My guess is to keep exhaust velocity high and to improve cat light off. We'll what happens when 4mermarine does his before and after dyno of the G37 y-pipe.
#604
Got my G37 HR-yipe on and I love it. I actually honed out the down tube openings just a bit to smooth the transistion from the larger cat openings to the smaller downtube openings... Not idea if it did anything whatsoever, but in my mind I'm content.
Subtle increase in sound and smoother shifting. Worth it!
Subtle increase in sound and smoother shifting. Worth it!
#605
finally i fixed the damn stupid rattling noise from my back muffler. Apparently when the muffler guy weld an extension on the Z midpipe the muffler got moved to the side a little bit and hit the heat shield.
Here is the sound of Z HR-yp and Z midpipe with stock muffler
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Here is the sound of Z HR-yp and Z midpipe with stock muffler
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#606
Got my G37 HR-yipe on and I love it. I actually honed out the down tube openings just a bit to smooth the transistion from the larger cat openings to the smaller downtube openings... Not idea if it did anything whatsoever, but in my mind I'm content.
Subtle increase in sound and smoother shifting. Worth it!
Subtle increase in sound and smoother shifting. Worth it!
Good to hear, glad to help you out.
#607
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i read that some of these people wit the hr y pipe are scraping when lowered. Im lowered a good amount and picking this up tonight. You scraping at all wit the tein springs? you have the z s/h tech or the g version?