Stock Cats

PR370z · 06-21-2010, 01:47 PM

Thinking about stripping out one of the two cats in the stock downpipe. Probably the second one, has anyone tried this? Looking for a little more HP and sound without the cost of a high flow cat. Any thoughts?

esfourteen · 06-21-2010, 02:02 PM

Quote:

Originally Posted by PR370z

Thinking about stripping out one of the two cats in the stock downpipe. Probably the second one, has anyone tried this? Looking for a little more HP and sound without the cost of a high flow cat. Any thoughts?

first, I think you might be confused as to the oem exhaust setup, theres 2 cats total, one on each side, right after the exhaust manifold, before the Y pipe. thats it, no pre/secondary cats.

second, dont ruin your stock cats, pick up a set of CNT resonated test pipes, they cost $200 shipped.

PR370z · 06-21-2010, 02:05 PM

Quote:

Originally Posted by esfourteen

first, I think you might be confused as to the oem exhaust setup, theres 2 cats total, one on each side, right after the exhaust manifold, before the Y pipe. thats it, no pre/secondary cats.

second, dont ruin your stock cats, pick up a set of CNT resonated test pipes, they cost $200 shipped.

Thanks for the clarification, for some reason I thought there were 4

kielbasa16 · 06-21-2010, 02:10 PM

Sorry to jack the thread, but I thought of this when I read the title. Cant you sell your stock cats for a good deal of money? Not necessarily to other Z owners but at a scrap metal yard or something? I remember somebody saying never throw away your stock cats, not just because you may need them someday, but cuz they are actually worth quite a bit of money (the cores or something?).

If the cost of the Hi-flow cats is stopping you, maybe look into selling the stock ones to ease the hit.

hfrog355 · 06-21-2010, 02:14 PM

Subscribed, because I'm cheap.

Quote:

Originally Posted by kielbasa16

Sorry to jack the thread, but I thought of this when I read the title. Cant you sell your stock cats for a good deal of money? Not necessarily to other Z owners but at a scrap metal yard or something? I remember somebody saying never throw away your stock cats, not just because you may need them someday, but cuz they are actually worth quite a bit of money (the cores or something?).

If the cost of the Hi-flow cats is stopping you, maybe look into selling the stock ones to ease the hit.

Lee123 · 06-21-2010, 05:55 PM

They've got to be worth something. They steal them off cars in parking lots here in Phoenix. Haven't heard much about it lately but a couple years ago people were going into movies and coming out and finding their car to be much louder than it was a couple hours before.

WarmAndSCSI · 06-23-2010, 03:51 PM

Quote:

Originally Posted by PR370z

Thanks for the clarification, for some reason I thought there were 4

No, you were pretty much correct. Considering which emissions tier this car is in, and that it is sold in the same form in California, you're going to find 2 cats per bank. On these cars, this will be in the form of 2 catalyst bricks per pipe - 1 "pre" cat, 1 "post" cat. It all appears to be 1 unit from the outside, but I'm pretty sure there are 2 catalyst components to each cat pipe.

Removing just one of those bricks but leaving the other one in-tact is a different story... you're probably better off not trying.

PR370z · 06-23-2010, 05:11 PM

Quote:

Originally Posted by WarmAndSCSI

No, you were pretty much correct. Considering which emissions tier this car is in, and that it is sold in the same form in California, you're going to find 2 cats per bank. On these cars, this will be in the form of 2 catalyst bricks per pipe - 1 "pre" cat, 1 "post" cat. It all appears to be 1 unit from the outside, but I'm pretty sure there are 2 catalyst components to each cat pipe.

Removing just one of those bricks but leaving the other one in-tact is a different story... you're probably better off not trying.

Im from PR, there is ways here to get by emission laws. I think if I strip out one brick from each bank would be sort of having a HFC, also from just looking at you cannot tell nothing has been done (for warranty reasons) I will let you guys know after I try it.

WarmAndSCSI · 06-23-2010, 05:24 PM

Quote:

Originally Posted by PR370z

Im from PR, there is ways here to get by emission laws. I think if I strip out one brick from each bank would be sort of having a HFC, also from just looking at you cannot tell nothing has been done (for warranty reasons) I will let you guys know after I try it.

No I understand you on that. I'm just referring to what has to come on new cars intended for sale in the US, by law.

But I wouldn't recommend removing just one of the cat bricks. Since the two work in tandem, you may be left with a really rotten smelling car depending on which cat brick you remove. Might as well just remove them both as it will just smell like raw, unburnt fuel then. Better than rotten eggs for sure!

PR370z · 06-21-2010, 05:52 PM

Quote:

Originally Posted by esfourteen

first, I think you might be confused as to the oem exhaust setup, theres 2 cats total, one on each side, right after the exhaust manifold, before the Y pipe. thats it, no pre/secondary cats.

second, dont ruin your stock cats, pick up a set of CNT resonated test pipes, they cost $200 shipped.

will the CNT resonated test pipes give me more sound, or is it better just to go with staright test pipes? Also I already have K&N drop ins, what kind of HP increase should I expect?

wishihadnav · 06-21-2010, 06:08 PM

yeah there's a small amount of platinum in cats.

tjlazer · 06-21-2010, 06:36 PM

You can get atleast $80 from a metal recycler for both cats.

hfrog355 · 06-22-2010, 10:13 AM

Anyone have experience doing this? Sounds like a great way to get some cash for spare parts to me...

Quote:

Originally Posted by tjlazer

You can get atleast $80 from a metal recycler for both cats.

Modshack · 06-22-2010, 11:22 AM

Quote:

Originally Posted by tjlazer

You can get atleast $80 from a metal recycler for both cats.

My recycler won't take them, primarily because of the theft issue noted above. I've got a fresh set of Corvette Cats in the garage that I'll probably sell to a california guy who unwittingly bought a modded car...

Zsteve · 06-22-2010, 07:28 PM

I would keep the stock cats just in case the HFCs go bad, that way you have a back up plan.

06-21-2010, 01:47 PM	#1 (permalink)
PR370z Base Member Join Date: Jun 2010 Location: Puerto Rico Posts: 108 Drives: 2008 BMW E60 M5 Rep Power: 15	Stock Cats Thinking about stripping out one of the two cats in the stock downpipe. Probably the second one, has anyone tried this? Looking for a little more HP and sound without the cost of a high flow cat. Any thoughts?

06-21-2010, 02:10 PM	#4 (permalink)
kielbasa16 Track Member Join Date: Jun 2009 Location: NY Posts: 770 Drives: 09 Blk Z Spt Rep Power: 17	Sorry to jack the thread, but I thought of this when I read the title. Cant you sell your stock cats for a good deal of money? Not necessarily to other Z owners but at a scrap metal yard or something? I remember somebody saying never throw away your stock cats, not just because you may need them someday, but cuz they are actually worth quite a bit of money (the cores or something?). If the cost of the Hi-flow cats is stopping you, maybe look into selling the stock ones to ease the hit. __________________ Mag Black Kielbasa

06-21-2010, 06:36 PM	#12 (permalink)
tjlazer A True Z Fanatic Join Date: Dec 2009 Location: Tacoma Age: 53 Posts: 2,496 Drives: Z34, R35 Rep Power: 20	You can get atleast $80 from a metal recycler for both cats. __________________ 2009 370Z Monterey Blue,Nismo Conversion,RE-11's, K&N Typhoon intakes,Blue Kickplates,Homelink,FI 18" CBE,ERZ HFCs,Hotchkis sways, Swift Spec-R, EVO-R Highwing, UPREV

06-22-2010, 07:28 PM	#15 (permalink)
Zsteve A True Z Fanatic Join Date: Sep 2009 Location: TX Posts: 3,298 Drives: the 2 balled club Rep Power: 22	I would keep the stock cats just in case the HFCs go bad, that way you have a back up plan. __________________ 2010 LS3 C6 Silver coupe corvette

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06-21-2010, 05:55 PM	#6 (permalink)
Lee123 Base Member Join Date: Apr 2010 Location: Phoenix Posts: 84 Drives: 2010 370Z Roadster Rep Power: 15	They've got to be worth something. They steal them off cars in parking lots here in Phoenix. Haven't heard much about it lately but a couple years ago people were going into movies and coming out and finding their car to be much louder than it was a couple hours before.

06-21-2010, 06:08 PM	#11 (permalink)
wishihadnav A True Z Fanatic Join Date: Nov 2009 Location: 90090 Posts: 1,851 Drives: Force Fed Nismo Rep Power: 184	yeah there's a small amount of platinum in cats.