370Z Downpipe?

ADmaster71690 · 03-04-2009, 01:31 PM

Hey, I know that a lot of turbocharged engines have large power gains when the stock cats are removed and replaced with a downpipe (MKIV Supra). Does anyone have an estimate on a hp gain for a 370Z downpipe? Is there a 370Z downpipe even out yet?

M.Bonanni · 03-04-2009, 02:06 PM

By downpipe do you mean high flow cats? The 370Z doesn't really have a downpipe since its not a turbo engine. There are exhaust manifolds/headers, cats/test pipes, y-pipes, and mufflers. Or cat-back exhausts which replace the muffler and y-pipe.

Berk Technology has high flow cats and test pipes out for the 370Z that had some pretty good gains on my car vs. the stock cats. Those are the only ones I have personal experience with.

ADmaster71690 · 03-04-2009, 06:49 PM

What I meant by a downpipe is a pipe that goes straight from the exhaust manifold to the rest of the exhaust system. This would completely remove the catalytic converters for better breathing.

But what brand high-flow cats do you recommend?

M.Bonanni · 03-04-2009, 07:00 PM

Yep, that would be either High Flow Cats or test pipes.

Like I said, the only ones I have personal experience with on a 370Z are the Berk Technology High Flow Cats and I absolutely love them. I have not one single complaint. I have done before & after dynos and a sound clip video with the stock exhaust and Berk HFCs.

Here is a link to my old group buy thread which has all of the information. The group buy is over now, but PM me if you want to order a set.

DDMotorsports: Berk Tech High Flow Cat/Test Pipe Group Buy!

MightyBobo · 03-05-2009, 06:26 AM

Here's a question for you, though. I only have experience totally removing my cats. Will HFC's still pass a sniffer test, or are they there to simply look pretty and pass a visual test?

shumby · 03-05-2009, 06:36 AM

I have experiance with Berk and Fast intentions HFC's both produce gains and both are hit and miss with throwing a CEL. I have had both Berk and FI HFC's on my G37S and they are the same HFC's thaty are used for th Z

M.Bonanni · 03-05-2009, 11:00 AM

Quote:

Originally Posted by MightyBobo

Here's a question for you, though. I only have experience totally removing my cats. Will HFC's still pass a sniffer test, or are they there to simply look pretty and pass a visual test?

It will probably depend on your state's smog laws. I have had cars with no cats pass our sniffer test here in Nevada.

MightyBobo · 03-05-2009, 04:05 PM

Quote:

Originally Posted by DDMotorsports

It will probably depend on your state's smog laws. I have had cars with no cats pass our sniffer test here in Nevada.

Sounds like that sniffer test simply plugs into your OBD2 and checks for CEL's heh.

NYS will actually take an O2 reading, for example - same w/ Cali and Texas I believe. So if its a CEL that you can tune out and make disappear, no big deal.

!xoible · 03-05-2009, 04:16 PM

remember based on your state law u might not need any smog check in a few years

M.Bonanni · 03-05-2009, 08:10 PM

Quote:

Originally Posted by MightyBobo

Sounds like that sniffer test simply plugs into your OBD2 and checks for CEL's heh.

NYS will actually take an O2 reading, for example - same w/ Cali and Texas I believe. So if its a CEL that you can tune out and make disappear, no big deal.

Thats somewhat new to NV. Even before the OBD2 check I have had cars with test pipes pass a traditional sniffer test here.

welderz · 03-05-2009, 08:37 PM

You still might might not pass the visual inspection. If they see that you don't have the stock catalytic converters it's an automatic fail on the inspection they won't even do the sniffer.

MightyBobo · 03-06-2009, 06:06 AM

Quote:

Originally Posted by welderz

You still might might not pass the visual inspection. If they see that you don't have the stock catalytic converters it's an automatic fail on the inspection they won't even do the sniffer.

Correcto. Ive heard Texas and Cali are no dummies - they know exactly where they should be. If it isn't there, fail. They can hammer you for something potentially ridiculous like $10000 per cat missing, as its a federal fine. Does this happen often? Nah, I'm sure they tell you to fix it and if you do, game on. But the possibility is there.

Other states like Nebraska dont even do bloody inspections PERIOD...it could be a rusting heap on 3 wheels, missing the 4th, and as long as it has a VIN it'll be good to go.

M.Bonanni · 03-06-2009, 10:15 AM

In Cali though, and someone correct me if I am wrong, don't you have 6 years before you have to smog a new car? Like you wouldn't have to smog your '09 370Z until 2015.

MightyBobo · 03-07-2009, 12:38 AM

Quote:

Originally Posted by DDMotorsports

In Cali though, and someone correct me if I am wrong, don't you have 6 years before you have to smog a new car? Like you wouldn't have to smog your '09 370Z until 2015.

This wouldnt surprise me. NY though, you get the full battery every single year AFTER you buy the vehicle (its inspected at the dealership when you buy a new one).

ADmaster71690 · 03-08-2009, 11:48 AM

i dont think we have any smog tests here in michigan.

03-04-2009, 01:31 PM	#1 (permalink)
ADmaster71690 Base Member Join Date: Mar 2009 Location: Detroit Posts: 79 Drives: 2003 Saab 9-3 Rep Power: 262	370Z Downpipe? Hey, I know that a lot of turbocharged engines have large power gains when the stock cats are removed and replaced with a downpipe (MKIV Supra). Does anyone have an estimate on a hp gain for a 370Z downpipe? Is there a 370Z downpipe even out yet?

03-04-2009, 02:06 PM	#2 (permalink)
M.Bonanni The370Z.com Sponsor Join Date: Nov 2008 Location: Las Vegas Posts: 2,575 Drives: Fast Rep Power: 1321	By downpipe do you mean high flow cats? The 370Z doesn't really have a downpipe since its not a turbo engine. There are exhaust manifolds/headers, cats/test pipes, y-pipes, and mufflers. Or cat-back exhausts which replace the muffler and y-pipe. Berk Technology has high flow cats and test pipes out for the 370Z that had some pretty good gains on my car vs. the stock cats. Those are the only ones I have personal experience with. __________________ MikeBonanni.com Twitter: http://www.twitter.com/MikeBonanni Facebook: http://www.facebook.com/MBonanni36 Function > Form

03-04-2009, 07:00 PM	#4 (permalink)
M.Bonanni The370Z.com Sponsor Join Date: Nov 2008 Location: Las Vegas Posts: 2,575 Drives: Fast Rep Power: 1321	Yep, that would be either High Flow Cats or test pipes. Like I said, the only ones I have personal experience with on a 370Z are the Berk Technology High Flow Cats and I absolutely love them. I have not one single complaint. I have done before & after dynos and a sound clip video with the stock exhaust and Berk HFCs. Here is a link to my old group buy thread which has all of the information. The group buy is over now, but PM me if you want to order a set. DDMotorsports: Berk Tech High Flow Cat/Test Pipe Group Buy! __________________ MikeBonanni.com Twitter: http://www.twitter.com/MikeBonanni Facebook: http://www.facebook.com/MBonanni36 Function > Form

03-05-2009, 06:36 AM	#6 (permalink)
shumby Captin Canuck Join Date: Dec 2008 Location: with your mom Age: 45 Posts: 6,288 Drives: your sister Rep Power: 237	I have experiance with Berk and Fast intentions HFC's both produce gains and both are hit and miss with throwing a CEL. I have had both Berk and FI HFC's on my G37S and they are the same HFC's thaty are used for th Z __________________ Originally Posted by SAM@GTM Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living . Sam

03-05-2009, 04:16 PM	#9 (permalink)
!xoible Base Member Join Date: Feb 2009 Location: west Posts: 245 Drives: some car Rep Power: 186	remember based on your state law u might not need any smog check in a few years __________________ welcome to the internet. now ur out of ur ***** mind if you get offended at this ** ^^^

03-04-2009, 06:49 PM	#3 (permalink)
ADmaster71690 Base Member Join Date: Mar 2009 Location: Detroit Posts: 79 Drives: 2003 Saab 9-3 Rep Power: 262	What I meant by a downpipe is a pipe that goes straight from the exhaust manifold to the rest of the exhaust system. This would completely remove the catalytic converters for better breathing. But what brand high-flow cats do you recommend?

03-05-2009, 06:26 AM	#5 (permalink)
MightyBobo A True Z Fanatic Join Date: Feb 2009 Location: Las Vegas, NV Posts: 8,465 Drives: No cars; only bikes Rep Power: 53	Here's a question for you, though. I only have experience totally removing my cats. Will HFC's still pass a sniffer test, or are they there to simply look pretty and pass a visual test?

03-05-2009, 08:37 PM	#11 (permalink)
welderz Base Member Join Date: Jan 2009 Location: PA Posts: 20 Drives: POS beater car Rep Power: 17	You still might might not pass the visual inspection. If they see that you don't have the stock catalytic converters it's an automatic fail on the inspection they won't even do the sniffer.

03-06-2009, 10:15 AM	#13 (permalink)
M.Bonanni The370Z.com Sponsor Join Date: Nov 2008 Location: Las Vegas Posts: 2,575 Drives: Fast Rep Power: 1321	In Cali though, and someone correct me if I am wrong, don't you have 6 years before you have to smog a new car? Like you wouldn't have to smog your '09 370Z until 2015. __________________ MikeBonanni.com Twitter: http://www.twitter.com/MikeBonanni Facebook: http://www.facebook.com/MBonanni36 Function > Form

03-08-2009, 11:48 AM	#15 (permalink)
ADmaster71690 Base Member Join Date: Mar 2009 Location: Detroit Posts: 79 Drives: 2003 Saab 9-3 Rep Power: 262	i dont think we have any smog tests here in michigan.