3" Exhausts and HFC Question

2011 Nismo#91 · 08-09-2013, 01:15 PM

Hi,

I search on here and in genearl about 3" Exhausts. It seems there are many 3" Downpipes, headers, and cat backs. But all HFC seem to use 2.5" tubing, at least that I can find. Why are there no 3" HFC? There must be a reason or I am just not understanding something about exhausts and am asking a stupid questions.

Chuck33079 · 08-09-2013, 01:18 PM

I think there's two 3" Z exhausts. GTM and FI. Fast Intentions sells a 3" exhaust with cats. 3" exhausts are for turboed cars. 2.5" is far more common because that's a good diameter for NA cars, and most people leave their Zs NA. Most people don't run cats on their turboed Z, leading to few people making 3" HFCs.

2011 Nismo#91 · 08-09-2013, 01:28 PM

Thanks for the quick reply. I was updating/revising my FI build list when I noticed the diameter difference. 3" TP would be nice and cheaper money wise, but I worry in NJ it wont pass emmisions test I do believe they still check the tail pipe. I looked on FI's site and didn't notice a stand along 3" cat, I will have to look up the exhaust with the cat option.

Went back to both mfg sites and don't see 3" Cats just 2.5" Cats and 3" Catbacks it listed there. =/

Chuck33079 · 08-09-2013, 01:56 PM

With the Fast Intentions setup, it may not be on their website. Give Tony a call and he'll set you up right.

2011 Nismo#91 · 08-09-2013, 02:02 PM

It's ok, just making a list of items and checking it twice.

08-09-2013, 01:15 PM	#1 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,400 Drives: slowly Rep Power: 40569	3" Exhausts and HFC Question Hi, I search on here and in genearl about 3" Exhausts. It seems there are many 3" Downpipes, headers, and cat backs. But all HFC seem to use 2.5" tubing, at least that I can find. Why are there no 3" HFC? There must be a reason or I am just not understanding something about exhausts and am asking a stupid questions.

08-09-2013, 01:18 PM	#2 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29538	I think there's two 3" Z exhausts. GTM and FI. Fast Intentions sells a 3" exhaust with cats. 3" exhausts are for turboed cars. 2.5" is far more common because that's a good diameter for NA cars, and most people leave their Zs NA. Most people don't run cats on their turboed Z, leading to few people making 3" HFCs. 2011 Nismo#91 likes this. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

08-09-2013, 01:28 PM	#3 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,400 Drives: slowly Rep Power: 40569	Thanks for the quick reply. I was updating/revising my FI build list when I noticed the diameter difference. 3" TP would be nice and cheaper money wise, but I worry in NJ it wont pass emmisions test I do believe they still check the tail pipe. I looked on FI's site and didn't notice a stand along 3" cat, I will have to look up the exhaust with the cat option. Went back to both mfg sites and don't see 3" Cats just 2.5" Cats and 3" Catbacks it listed there. =/ Last edited by 2011 Nismo#91; 08-09-2013 at 01:38 PM.

08-09-2013, 01:56 PM	#4 (permalink)
Chuck33079 A True Z Fanatic Join Date: Nov 2011 Location: Houston Posts: 12,265 Drives: 2011 370ztt Rep Power: 29538	With the Fast Intentions setup, it may not be on their website. Give Tony a call and he'll set you up right. __________________ 2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

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08-09-2013, 02:02 PM	#5 (permalink)
2011 Nismo#91 A True Z Fanatic Join Date: Mar 2011 Location: NJ Posts: 2,400 Drives: slowly Rep Power: 40569	It's ok, just making a list of items and checking it twice.