H-Pipe Replacement on Nismo

XLR8SN

True...the muffler isnt that that bad...the restriction is a lot more in the cats and the H-pipe area.....I think.

FL 4Motion

You are correct. I made a thread a while back where I measured our oem nismo exhaust at different points and the H pipe was necked down to 2.1" and the post H pipe pipes to the muffleer were 2.4".

so basically, other than the H pipe, we have a 2 1/2" exhaust and the cats and the H pipe are the restriction.

That said, you'll save some considerable weight too, switching out the oem nismo exhaust for something like the FI cbe. That's what ultimately swayed me into getting the FI CBE vs. having a shop fab up and x pipe for me. I wanted to benefit form the weight savings too.

XLR8SN

Nothing is "wrong" with the FI exhaust per se....I just wanted to use the OEM hangers in the back and I am not a fan of the muffler cans pointing out.

But...the replacement of the mid pipe would be great and still help the exhaust system a bit.

280z/300zx

Didn't have this problem on my Nismo. I originally had an 09 touring sport and after it was totalled I replaced it with a 2010 Nismo. I transfered over my FI 18" resonator carbon fiber muffler exhaust over to my Nismo in just 45min. The hangers all lined up with no problems. The tips look great and don't stick out too far, nor are they tucked back too far. Looks good, sounds much better than the stock nismo exhaust, and there is definitly an power increase.

Sure an H-pipe replacement would be nice but if you are going to upgrade the exhaust you might as well go for a full cat-back

XLR8SN

Understood.....its just that I have the Amuse Nismo version exhaust back there. Kind of would like to keep that.

Just need to have a H-Pipe or an X-Pipe fabricated WITH flanges that go from the cats to the mid-pipe. So far, I still have not seen another company other than Sunline and Amuse with a replacement piece for that section only.

If Tony at F.I. is interested.....I am in when it comes out. Though, if they can run resonators in that section, it would cut a lot of rasp down as well.

Someone help out Tony please so he can help us out in return. I am definitely too far away.

Gauge

I would already own their cat back if I could use the OEM hangers lol and no cutting in the passenger rear.

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XLR8SN

Yup...I agree. Based on my past experiences with various other exhausts and all....I think that I really prefer using the OEM hanger locations and mounts. Custom mounts had a tendency to fail over time on me.

No I am not saying that the F.I. version will fail....just my preference.

I am still waiting with everyone in getting a H or X pipe option for the Nismo model. My Sunline H pipe has flanges that are misaligned and I have too many gaskets in there to compensate. And I think that it still leaks a little.

Compdoc777

From what I am told is the cats are the restriction. Any one can do a muffler delete and get the trick carbon fiber muffler with titanium blue tips for $60 off eBay and have them added to the rear of the current exhaust and have the same performance and sound as the 1200-1500 exhaust and still retain the heat shielding so you are not cooked from below.

I am on the fence of the x-pipe it works well for the 370z but I felt more performance when I had the Nismo exhaust on the car. I could feel the difference when I took it off but it was smoother, but think that is the balancing rubbers on the bottom of the exhaust.

chops

theres definitely a restriction at the H-pipe as well. if you have a high flow cat, the pipe is 2.5". the opening to the H-pipe i believe was 2.25" and then it opens back up to 2.5" before it hits the muffler. from what a tech at a local shop told me, it was probably done to increase backpressure. he told me opening it up to 2.5" might increase the power a bit, but of course thats all hearsay.

with that said, heres another bump. still want an X-pipe or some sort of replacement for our nismo's!

Compdoc777

What I noticed on my 370z is that the pipe is smaller coming from the cats the Nismo is 2.5 from the cat back. The cats on my 370 looked like 2.25. Now on the Nismo I don't know I have not had the exhaust off. The gaskets are 2.5. If the cats were the same 2.25 as the 370z that is where the restriction would be. Also think the muffler is a big restriction. Thinking about getting some stainless CF rapped mufflers off ebay and adding those just to the end and later some high flow cats or straight pipes.