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ISR Performance Long Tube Headers (LTH) + o2 extension package
ISR LTH,ISR,ISR long tube headers,370z,g37,350z,g35

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Available for local pick up or shipping!
Price $825.00
Sale Price $799.99

Stock Status:Out of Stock

o2 extensions*:
Type 1
Type 2
Type 3
Type 4


ISR Performance HGC Long Tube Headers - VQ35DE/HR/VHR

Nissan 350Z/Infiniti G35/Nissan 370Z/Infiniti G37

Out of stock! This is for backorders only, restock ETA is late April. All backorders will ship soon as we receive the latest batch.

This package deal includes a set of ISR long tube headers (LTH) with a pair of our plug and play o2 extensions.You will NOT find a better deal anywhere else!!!

The ISR long tube headers are constructed with 304 brushed stainless steel and heavy duty flanges. Designed with a stepped primary, these headers are built to retain as much low and mid range torque as possible while allowing for good top end horsepower gains as well.

The innovative High Ground Clearance, "HGC" design places the collector in a position to maximize ground clearance without sacrificing performance.

Each header features 2 o2 bungs placed downstream of the collector so that you can utilize your factory upstream and downstream o2 sensors. Our plug and play extensions for the upstream o2 sensors make this process seamless!!!

Which "Type" of o2 extension do you need?
To verify which type of extension your car needs, Simply pop your hood and look at the connector on your upstream o2 sensor. It will be located near the firewall area, and can be seen from either driver or passenger side of the car. If you are still unsure of which type you need, Please contact us prior to placing an order and we will be glad to further assist you. Extensions are for HR/VHR vehicles only.


  • Stainless Steel Long Tube Headers (2)
  • 2 bolt exhaust gaskets (2)
  • Head to manifold gaskets (2)
  • o2 sensor bung plugs (4)
  • Exhaust Nuts (4)
  • Exhaust Bolts (4)
  • NISformance o2 extensions (2)

o2 extension Types:
Type 1- rectangle with side tabs near the bottom
Type 2- square with left side tab near bottom right side tab near top
Type 3- square with side tabs near bottom
Type 4- square with side tabs near top
  • HR 350z
  • HR G35
  • 370z
  • G37
  • Q50 (VHR)
  • Q60 (VHR)
Please note - o2 extensions are NOT returnable, nor exchangeable. Please check the connector type on your own o2 sensor prior to placing an order. If you need help choosing the correct type, please contact us through FB,IG, or email Info@NISformance.com.

*Free shipping to the lower 48 states only* If you are outside of the lower 48 or need international shipping please contact us for a quote.


Average Rating: Average Rating: 4.5 of 5 4.5 of 5 Total Reviews: 10 Write a review »

  0 of 0 people found the following review helpful:
5 of 5 January 27, 2023
Reviewer: Cody P from MI United States  

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  0 of 0 people found the following review helpful:
5 of 5 Definitely quality! December 15, 2022
Reviewer: Alex Saravia from Houston, TX United States  
Good quality of customer service, fast shipping, they really take care and answer u questions and give u advice if u need it

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  1 of 1 people found the following review helpful:
5 of 5 350z Long Tube Headers December 12, 2022
Reviewer: Michael Faxox from VERO BEACH, FL United States  
They came really quick within a few days and were in mint condition. Also came with the o2 sensor extensions and great packaging. Welds looks great and the overall header is great quality. Definitely recommend ordering from here.

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  1 of 1 people found the following review helpful:
5 of 5 G37 ISR Long Tube Headers October 5, 2022
Reviewer: Quincy from Forest city, NC United States  
I was pleasantly surprised to the gains I picked up with these ISR headers. My previous setup I had hks exhaust, isr hfc, z1 race intakes and made 320/265. I switched over to these isr long tube headers and picked up a surprising 18 wheel hp over that previous setup. Car is now making 338/273! Money well spent! I only expected to make 10 wheel hp max over the hfc.

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  0 of 0 people found the following review helpful:
1 of 5 Bad customer service September 20, 2022
Reviewer: Fady  
Came with bad welds on heads, they refused to help. Don’t recommend buying the lth from them.----------------------------------NISformance reply, as we told you in email they looked just like the other ones we have. They are totally fine and work as intended,  you expected PPE quality with  ISR prices.

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