Stock Cats

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!

kevin8086 · 12-06-2010, 07:42 PM

i have an extra pair of cats. there are 4 total. 2 per pipe. there is a cat then the rear O2 sensor then another cat after that. i just gutted the one behind the O2 sensor in both pipes so i dont get a cell. i will let you know about sound level and smell when i install them this week(end). BTW it is kind of a pain in the A$$ to gut them so i hope it's worth it.

chops · 12-06-2010, 07:59 PM

Quote:

Originally Posted by kevin8086

i have an extra pair of cats. there are 4 total. 2 per pipe. there is a cat then the rear O2 sensor then another cat after that. i just gutted the one behind the O2 sensor in both pipes so i dont get a cell. i will let you know about sound level and smell when i install them this week(end). BTW it is kind of a pain in the A$$ to gut them so i hope it's worth it.

uh what? theres 2 cats on our cars - right after the header. i believe there are 2 resonators after the Y pipe, but those are not catalytic converters.

oh by the way...nice job bumping an olddd thread

christian370z · 12-07-2010, 01:03 AM

The catalytic converter section in the stock exhaust has two separate converters build in, one before the bend and one after.

kevin8086 · 12-07-2010, 05:23 PM

Quote:

Originally Posted by christian370z

The catalytic converter section in the stock exhaust has two separate converters build in, one before the bend and one after.

yes, what he said. i know because i just spent 2 hours gutting the secondary ones. i dont think im going to put them on now though. i spent like 2 hours trying to remove the top outer bolt and tore up my hands and arms and could not get it so im not going through all that just to maybe change it back.

Zsteve · 12-07-2010, 11:46 PM

Keep your stock stuff. I put on HFCs and after awhile I didnt like the rasp so I was able to put stock cats back on cuz I saved them. That way I wasnt stuck with a sound I didnt like or payed again for a stock item. By the way I have a pair of ERZ HFCs that only have about 1K miles on them for sale. lets say $150.

chops · 12-08-2010, 12:42 AM

Quote:

Originally Posted by Zsteve

Keep your stock stuff. I put on HFCs and after awhile I didnt like the rasp so I was able to put stock cats back on cuz I saved them. That way I wasnt stuck with a sound I didnt like or payed again for a stock item. By the way I have a pair of ERZ HFCs that only have about 1K miles on them for sale. lets say $150.

aye...so even after 1k miles there was still a lot of rasp?

IDZRVIT · 12-08-2010, 07:49 AM

Quote:

Originally Posted by Modshack

Never sell your stock stuff.

1) the parts aren't worth much

2) You never know when you may need to bring it back to stock either for a sale or an emissions issue

3) Aftermarket parts can be easily sold later

Excellent advice. I keep all my Harley oem parts. Aftermarket parts don't increase the resale value of the vehicle. Take them off and sell sepearately when it's time to trade/sell.

IDZRVIT · 12-08-2010, 11:11 AM

A truckload of cats may be worth something. Platinum is trading at $1600+ an ounce and rhodium is over $2200 an ounce. Darn things are more expensive than gold!

Zsteve · 12-08-2010, 12:52 PM

Quote:

Originally Posted by chops

aye...so even after 1k miles there was still a lot of rasp?

More than I liked but not excessive in some peoples ears.

ERZperformance · 12-11-2010, 08:55 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?

Get a test pipe because in the future you might want to sell your car and the new owner will want those OEM Cats on the car.

12-07-2010, 01:03 AM	#21 (permalink)
christian370z A True Z Fanatic Join Date: Jul 2010 Location: Newport Beach Posts: 3,900 Drives: 2010 370Z/Saab 900se Rep Power: 431	The catalytic converter section in the stock exhaust has two separate converters build in, one before the bend and one after. __________________ -320whp / 259wftlbs- SP Rays -- RE-11s -- SpecialtyZ Tune -- Swift Springs -- Stillen 25R Oil Cooler -- Stillen G3 Intakes -- Berk HFCs -- F.I. 12" CBE -- Stillen Sway Bars -- Es14 Spring -- INGS+1 lip -- CF Spoiler -- GTR Start Button -- VLED Parking Lights -- PWJDM V2 shift knob

12-07-2010, 11:46 PM	#23 (permalink)
Zsteve A True Z Fanatic Join Date: Sep 2009 Location: TX Posts: 3,298 Drives: the 2 balled club Rep Power: 21	Keep your stock stuff. I put on HFCs and after awhile I didnt like the rasp so I was able to put stock cats back on cuz I saved them. That way I wasnt stuck with a sound I didnt like or payed again for a stock item. By the way I have a pair of ERZ HFCs that only have about 1K miles on them for sale. lets say $150. __________________ 2010 LS3 C6 Silver coupe corvette

12-08-2010, 11:11 AM	#26 (permalink)
IDZRVIT A True Z Fanatic Join Date: May 2009 Location: Halifax Posts: 1,659 Drives: '13 CTS-V, '76 Vette Rep Power: 27	A truckload of cats may be worth something. Platinum is trading at $1600+ an ounce and rhodium is over $2200 an ounce. Darn things are more expensive than gold! __________________ "America.... still builds rockets!" Vette: 355 cid, 400 rwhp '13 CTS-V Coupe: 6.2L LSA, 556HP

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12-06-2010, 07:42 PM	#19 (permalink)
kevin8086 Base Member Join Date: Oct 2010 Location: Austin Posts: 228 Drives: 09 370Z Sport Rep Power: 14	i have an extra pair of cats. there are 4 total. 2 per pipe. there is a cat then the rear O2 sensor then another cat after that. i just gutted the one behind the O2 sensor in both pipes so i dont get a cell. i will let you know about sound level and smell when i install them this week(end). BTW it is kind of a pain in the A$$ to gut them so i hope it's worth it.