Can someone please rate the gains of the various high flow cats out there....oh, and where to get them????

I'm looking at the magnaflow cats only because they seem to pass all the emissions tests...otherwise, I imagine a test pipe with some sort of silencer would be best. I saw R/T cats are for offroad use only...so what's the point?? Any input would be great! Thanks!!!

 

I just finished installing R/T cats. You might want to talk to Jeff or Jason at Performance Nissan about "offroad use only". Probably more of a CYA. I have with a Borla Exhaust System and they are GREAT.

 

Supposedly the Kinetix have passed California emissions testing. Strictest in the country.

 

The ones from Ultimae that we offer are 50 state legal as well

HP gains are all about the same - ranges from 5-9 give or take, but depends on other mods

 

How much are these?

 

$439.00 for the pair + shipping

 

r/t cats passed the sniffer.... but probably will not pass any visual inspection. here in california, the mechanic/smog technician is suppose to give a visual inspection, but they never do.

 

I wonder if they'll still "pass the sniffer" after a couple of years. The warrantee on emissions is only good for two years and it doesn't look like they contain a lot of catalyst material to begin with.

 

Kinetix offers a down pipe with resonator...but the HP is the same. The only reason to get the high flow cats versus the straight pipe would be to avoid having to switch it out when it comes time for emissions testing. (And having to keep the old cats in the garage taking up space). I'm concerned about passing the sniff test more than anything.
If the R/T's pass the test, that's great!
Do they offer the most HP, or are the all comparable?

 

The R/T has the best flow of the tested CATS out there. It flows almost as well as straight pipes. There is a flow sheet floating around on this forum that showed the flow rate comparisons between stock vs test pipes vs Crawford vs R/T.

 

I have the RT's and love'em.

Just back from driving my Z and it sounds sweet.
I always drive with the windows down

Got'em at Performance Nissan of course.

 

I just ordered Kinetix test pipes; it's the best option for me as it gives the best flow (I'm also looking into turbo in the not too distant future) and I don't have to worry about emissions.

 

The ones from Ultimmte offer a 5 year warranty, and would easily pass visual inspection as well

 

Here's what I discovered about the RT cats

I cant comment on the other brands, but these worked for me.

 

The R/T's are 50 state CARB approved (except in Calif????) Go figure. Here's the only chart I have.... but I think there is a better one floating around out there. This is the flow bench chart done by T/S.

 

Ummm...CARB is the California Air Resources Board, right? How can they be 50 state California approved, but not in California?

 

So goes the politics of the great state of Calif!! According to CARB, they are approved... but none are legal on OBDII cars (in Calif)??????????????????

 

Technically, I don't think you are even supposed to touch the emissions systems on new cars for 5 years unless there is a failure anyway. So go ahead, break the law....

 

I would never think about breaking the law

 

I agree...that would be unethical, childish, stupid and irresponsible!!!


ha ha ha!!!