Which Aftermarket Cats?

[piran1]

Any feedback on which aftermarket cats would pass emissions? High-flow options, Prospeed, SOS, Random Technologies, etc. Also have seen DEC, Benchmark which are OEM style. I know that OEM is best but are any of these other options considered good alternatives?

 

[robbiedawg]

i have just ordered the angus hi-flow cats.here is a thread on them-
http://www.nsxprime.com/forum/showt...and-Hi-Flow-cats?highlight=angus+hi+flow+cats

angus,whose name is wil,has been great to deal with.he is very knowledgeable about nsx's as an owner and a mechanic,and has spent lots of time answering my questions.the workmanship on his cats,and on other products he makes like exhausts,looks beautiful. compared to oem,these will add some power,save some weight,and are much less expensive.

 

[efett]

I have ProSpeed with 300 cell fill and have been happy with them.

 

[chudson1549]

Random techs here

 

[willabeest]

Any feedback on which aftermarket cats would pass emissions? High-flow options, Prospeed, SOS, Random Technologies, etc. Also have seen DEC, Benchmark which are OEM style. I know that OEM is best but are any of these other options considered good alternatives?

suggest you check local regs. in California there is only one aftermarket approved cat for the NSX. the random cats lost their approval about 2 year ago.
need to be careful. also the 3.0 liter and 3.2 liter engines use different cats.
i have used these DEC with success but they are not as good as OEM.

 

[davidf]

We don't test here but my 200 cell Prospeeds keep the exhaust tips nice and clean. They may pass.

 

[piran1]

I went with Angus' AP-X 300 cell cats. Very nice quality both form and function!

Just for laughs check out the before and after for the Emissions test results.

Before:



After:



Just a couple of pics: