Considering replacing H pipe on NISMO exhaust

MigMac · 04-22-2014, 06:18 PM

Hello everyone. I have had my NISMO Z for about a year and I think it is about time for some HFC's. While considering replacing the entire exhaust system I have decided on keeping the stock NISMO system and possibly replacing the H pipe section. If I am correct, the H pipe section is only around 2.25 inches in diameter with the remainder of the system around 2.5 inches. I am replacing the cats with Berks. I think it would be weird going from 2.5 cats back to a 2.25 H pipe. I am thinking of adding a custom 2.5 inch H or X pipe to keep the diameter consistent from the cats all the way back.

Does anyone have any experience with this idea? Are there any aftermarket X pipes out there? Any info would be appreciated.

Apollo8642 · 04-22-2014, 07:32 PM

I'm going down the same road very soon. I've been eyeing the AAM pipe super hard sense it will bolt on directly.

AAM Competition - Nissan GT-R, 370Z Turbo Performance Specialists

MigMac · 04-22-2014, 07:47 PM

Hmmmm. Interesting piece.

nobdy_#608 · 04-22-2014, 09:32 PM

i have the AAM midpipe as well and shortails and i love it

MigMac · 04-22-2014, 10:18 PM

Reading AAM's website it sounds as if none of the NISMO exhaust is 2.5".

FL 4Motion · 04-23-2014, 12:55 AM

Nismo oem H pipe is around 2.1" and the intermediate pipes to the muffler are 2.4" as measured on my old '10 nismo. The AAM comp Midpipe cbe replaces all that with what we should have got, a true 2.5" cbe.

I'm running it with the oem muffler section and very happy with it.

MigMac · 04-23-2014, 03:29 PM

Thanks for the measurements. I am sure the stock system is all sized out in metric measurements. I am checking with a guy this week or next about creating an X pipe using a Magnaflow x pipe section. I am just debating whether to make the section 2.25" or 2.5". I don't want to slow the exhaust gas down too much going to 2.5" x pipe and ruin the scavenging effect, nor do I want to choke the system down going to 2.25". Too many decisions!

fuct · 04-23-2014, 05:48 PM

That aam piece claims 20+ hp and torque? damn!

FL 4Motion · 04-23-2014, 08:20 PM

Quote:

Originally Posted by MigMac

Thanks for the measurements. I am sure the stock system is all sized out in metric measurements. I am checking with a guy this week or next about creating an X pipe using a Magnaflow x pipe section. I am just debating whether to make the section 2.25" or 2.5". I don't want to slow the exhaust gas down too much going to 2.5" x pipe and ruin the scavenging effect, nor do I want to choke the system down going to 2.25". Too many decisions!

For reference, the fast intentions X pipe/cbe is 2.5" and the AAM H pipi/cbe is also 2.5" so IMO, I'd go 2.5".

Quote:

Originally Posted by fuct

That aam piece claims 20+ hp and torque? damn!

Iirc, that's when paired w/short tails. With the oem muffler it's a bit less.

FISH22 · 04-23-2014, 09:51 PM

Does the AAM mid pipe add a bit of sound? I don't want my Nismo to be much louder, just a tad more sound while retaining the factory exhaust.

FL 4Motion · 04-23-2014, 10:02 PM

Quote:

Originally Posted by FISH22

Does the AAM mid pipe add a bit of sound? I don't want my Nismo to be much louder, just a tad more sound while retaining the factory exhaust.

As long as you keep the oem nismo muffler it's just atad louder and deeper, pretty suble change (for the better).

takjak2 · 04-25-2014, 03:44 PM

I have berk HFC, AAM midpipe, and the Nismo muffler. Sounds and performs great

FISH22 · 04-25-2014, 08:23 PM

Great info, thanks guys.

burgerga · 05-16-2014, 02:25 AM

Quote:

Originally Posted by takjak2

I have berk HFC, AAM midpipe, and the Nismo muffler. Sounds and performs great

That sounds like a great way to go. Been looking for someone with a setup like this (Berks or FI HFCs) to see how they liked it. Got any videos? What's your intake situation?

Jordo! · 05-16-2014, 04:47 AM

Any extra hiss going to the bigger diameter pipe? I'd be (pleasantly) surprised if not...

04-22-2014, 06:18 PM	#1 (permalink)
MigMac Base Member Join Date: Feb 2014 Location: Shawnee, KS Posts: 20 Drives: '13 370Z Nismo Rep Power: 11	Considering replacing H pipe on NISMO exhaust Hello everyone. I have had my NISMO Z for about a year and I think it is about time for some HFC's. While considering replacing the entire exhaust system I have decided on keeping the stock NISMO system and possibly replacing the H pipe section. If I am correct, the H pipe section is only around 2.25 inches in diameter with the remainder of the system around 2.5 inches. I am replacing the cats with Berks. I think it would be weird going from 2.5 cats back to a 2.25 H pipe. I am thinking of adding a custom 2.5 inch H or X pipe to keep the diameter consistent from the cats all the way back. Does anyone have any experience with this idea? Are there any aftermarket X pipes out there? Any info would be appreciated.

04-22-2014, 09:32 PM	#4 (permalink)
nobdy_#608 Base Member Join Date: Jul 2012 Location: dallas Posts: 79 Drives: '12 PW Nismo #608 Rep Power: 13	i have the AAM midpipe as well and shortails and i love it __________________ AAM Cold Air Intake, JWT lightweight flywheel, CC Stage 2 clutch, AAM short tails w/ mid pipe, DFW SAA NvUS

04-25-2014, 03:44 PM	#12 (permalink)
takjak2 A True Z Fanatic Join Date: Feb 2011 Location: Sterling, VA Posts: 1,922 Drives: Legit Racecar 370Z Rep Power: 142	I have berk HFC, AAM midpipe, and the Nismo muffler. Sounds and performs great nvdave04 likes this. __________________ Mods \| Stuff \| Things \| Seat Time \| Nismo facebook.com/TeamSparrowSpeed

05-16-2014, 04:47 AM	#15 (permalink)
Jordo! A True Z Fanatic Join Date: May 2010 Location: nirvana Posts: 6,394 Drives: 2023 NATM Rep Power: 418	Any extra hiss going to the bigger diameter pipe? I'd be (pleasantly) surprised if not... __________________ Enjoy it. Destroy it.

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04-22-2014, 07:32 PM	#2 (permalink)
Apollo8642 Base Member Join Date: Feb 2012 Location: Oregon Posts: 187 Drives: 09 370Z Nismo #280 Rep Power: 13	I'm going down the same road very soon. I've been eyeing the AAM pipe super hard sense it will bolt on directly. AAM Competition - Nissan GT-R, 370Z Turbo Performance Specialists

04-22-2014, 07:47 PM	#3 (permalink)
MigMac Base Member Join Date: Feb 2014 Location: Shawnee, KS Posts: 20 Drives: '13 370Z Nismo Rep Power: 11	Hmmmm. Interesting piece.

04-22-2014, 10:18 PM	#5 (permalink)
MigMac Base Member Join Date: Feb 2014 Location: Shawnee, KS Posts: 20 Drives: '13 370Z Nismo Rep Power: 11	Reading AAM's website it sounds as if none of the NISMO exhaust is 2.5".

04-23-2014, 12:55 AM	#6 (permalink)
FL 4Motion A True Z Fanatic Join Date: Feb 2009 Location: FL Posts: 4,776 Drives: Baby Shark Rep Power: 701615	Nismo oem H pipe is around 2.1" and the intermediate pipes to the muffler are 2.4" as measured on my old '10 nismo. The AAM comp Midpipe cbe replaces all that with what we should have got, a true 2.5" cbe. I'm running it with the oem muffler section and very happy with it.

04-23-2014, 03:29 PM	#7 (permalink)
MigMac Base Member Join Date: Feb 2014 Location: Shawnee, KS Posts: 20 Drives: '13 370Z Nismo Rep Power: 11	Thanks for the measurements. I am sure the stock system is all sized out in metric measurements. I am checking with a guy this week or next about creating an X pipe using a Magnaflow x pipe section. I am just debating whether to make the section 2.25" or 2.5". I don't want to slow the exhaust gas down too much going to 2.5" x pipe and ruin the scavenging effect, nor do I want to choke the system down going to 2.25". Too many decisions!

04-23-2014, 05:48 PM	#8 (permalink)
fuct A True Z Fanatic Join Date: May 2009 Location: Sugar Land Posts: 3,692 Drives: 97' Ranger :) Rep Power: 24	That aam piece claims 20+ hp and torque? damn!

04-23-2014, 09:51 PM	#10 (permalink)
FISH22 Base Member Join Date: Jan 2014 Location: Virginia Age: 41 Posts: 131 Drives: '11 E90 M3 Rep Power: 11	Does the AAM mid pipe add a bit of sound? I don't want my Nismo to be much louder, just a tad more sound while retaining the factory exhaust.

04-25-2014, 08:23 PM	#13 (permalink)
FISH22 Base Member Join Date: Jan 2014 Location: Virginia Age: 41 Posts: 131 Drives: '11 E90 M3 Rep Power: 11	Great info, thanks guys.