I kept my stock cats when I installed my LT headers, X-pipe, and cat back to make sure I did not have any emmision issues come testing time. If I go with the high flow cats from Random I am assuming they/my car will pass emmisions without to much fan fare ? Also, do the high flow cats make the car louder and how much extra HP if any do they provide ? Thanks for the advice.... :z:
Package
package,
I have no idea what smog laws are in place in your area of PA. As of this month, Bucks country is switching over to OBD-2 checking of newer cars - no tailpipe checks. They will just read the computer to see if any codes or errors come up.
So if the 02 sensors or 02 sims are not throwing codes you should be alright, I would think. However, I have yet to hear anyone going through this yet. Did my LG's with RT cats right after inspection this spring to have time to figure this out.
I have no idea what smog laws are in place in your area of PA. As of this month, Bucks country is switching over to OBD-2 checking of newer cars - no tailpipe checks. They will just read the computer to see if any codes or errors come up.
So if the 02 sensors or 02 sims are not throwing codes you should be alright, I would think. However, I have yet to hear anyone going through this yet. Did my LG's with RT cats right after inspection this spring to have time to figure this out.
I just went with RT Hi-Flos and 3" xpipe to go with the 3" collectors on my BPP LT's yesterday. Have the stock Ti's on and the tone is a lot better.
Thanks for the replies. I am just trying to figure out if the high flow cats are worth the $500 entry fee ? I am not sure what our county (Berks) does for testing but I think they use the tailpipe sniffer and do not plug in under the dash ? If the high flow cats only give 5HP or so I do not think they are worth the $500. If the gain is minimal I will save the cash and put it into some OEM chrome rims.....
Yeah.. Look at what you have in your car too. I guess it depends on the other mods that you have done. I didn't see much and the headers were done at the same time that the cats and x pipe were, so it was hard to tell. Maybe the tone is different, but I can't see the noise level being that different. Even with the headers and stock Ti exhaust, the difference wasn't that noticeable over the stock manifolds, cats and x-pipe.
X
Not necessarily. If the PCM is storing a 'test incomplete' (ie: the readiness monitor is set to 'not ready') you might fail. Most states only permit two incompletes as shown during an OBD2 scan.
This means the CAT efficiency test has not yet been completed for some reason, typically not enough driving cycles since the last LS1 edit, other PCM reflash or a battery disconnection. This will not result in a code, it just means the test has not completed yet. Other possibilities are a 'test failed' which will cause a code to set.
Of course if you do not have CATs installed and you have deleted the codes then you won't see a code. The test will still run however and when it fails, because there are no CATs, you just won't see the code.
O2 sims on the other hand fool the PCM into thinking the CATs are present and working.
I have the RT cats and was able to pass the OBD-II testing. Just be sure that evrything O2 sensors, cats etc. are warmed up well when you bring the car in.Backlash said:
As for sound - there has been quite a bit of discussion about it and it seems (to me) that for some no difference was noticed. For me several parameters (higher CR, cam and CI) changed and I noticed a huge difference in exhaust sound. :cheers:
Package,Package said:
I think Siska's answer really helps here. He had just Long tube headers and decided to go with RT's too. The RT's really do make a differnce, but without the long tubes I would personally would not do it. Emission testing, Bucks is changing the runs this month, so if Berks is then you can find out with a simple visit to a testing station.
Thanks no Doubt, that was the answer I was looking for. :thumb:No Doubt said:
Here's another thing that hasn't been brought up very often. If you live in a state with emissions testing of any kind and you fail for some reason you may have to have the car inspected or repaired by an emissions certified repair station. That is the case here for example.
The problem is if you have removed any OEM emissions equipment, or altered it in any way, you will not receive a waiver. This includes CATs as well as rear O2 sensors. This equipment must be on the car in order to receive a waiver as long as all other requirements are met. In some states you can't get a waiver if the car has less than 50,000 miles for example.
In states that have a visual inspection, like California, and the inspector takes the time to look and knows what to look for, you would fail if you didn't have CATs or rear O2 sensors installed.
Technically it is illegal to remove a properly functioning OEM CAT. They can be replaced with an aftermarket CAT only when the OEM CAT has been damaged or rendered inoperative for some other reason. In fact, the replacement is supposed to come with a certificate from its manufacturer that must be signed by the vehicle owner and installer and kept on file for six months by the installer.
Just for the record, my OEM CATs were damaged in an off-road excursion and sadly, as well as at great expense, had to be replaced with Random Tech high flow CATs.
The problem is if you have removed any OEM emissions equipment, or altered it in any way, you will not receive a waiver. This includes CATs as well as rear O2 sensors. This equipment must be on the car in order to receive a waiver as long as all other requirements are met. In some states you can't get a waiver if the car has less than 50,000 miles for example.
In states that have a visual inspection, like California, and the inspector takes the time to look and knows what to look for, you would fail if you didn't have CATs or rear O2 sensors installed.
Technically it is illegal to remove a properly functioning OEM CAT. They can be replaced with an aftermarket CAT only when the OEM CAT has been damaged or rendered inoperative for some other reason. In fact, the replacement is supposed to come with a certificate from its manufacturer that must be signed by the vehicle owner and installer and kept on file for six months by the installer.
Just for the record, my OEM CATs were damaged in an off-road excursion and sadly, as well as at great expense, had to be replaced with Random Tech high flow CATs.
Speaking of stealing perfectly good parts off a car: back in the day a friend of mine in college was working as the night maintenance guy at a restaurant. I needed a transmission for an upcoming...event. Sooo, myself and a couple friends decided that he really didn't need his at the time so we...borrowed it one night while he was at work. 
Well.. Yeah.. Of course you borrowed it. The tranny probably wasn't in the same condition after you returned it though.
The story just reminded me of the people that rented those old Hertz Mustangs and then did engine swaps before they returned their rentals. Nowadays with the GPS systems in the rentals, you can't do anything with a rental car.
On topic: I hope and pray that my car passes emissions. I haven't run it through yet. They don't do visual inspections, so I should be fine.
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