im currently running catless but thinking about getting a cat because im moving to chicago where there is emission test every so often... and i don't want to get caught without it...

heres my question...would changing an test pipe with a high flow cat affect performance?...i did some search but couldn't find any definite answers...

and any recommendations of high flow cats??/

 

Yes, of course, HFCs flow much less than test pipes. If you're worried about emissions inspections, then just unbolt your test pipe, slap in the stock cat, then go get inspected. Come home, and do the switcharoo. That's what's great about a test pipe vice the one piece downpipe/cat-delete combos.

 

i have the RSR stainless downpipe which eliminates the cat also... im not worry so much about emission testing.. but getting pulled over with it... i actually have an quieter exhaust system....

this is just a thought....any way to make test pipe look like cat?...lol

 

Yes, you can take the heat shielding from the stock cat and rig it to surround the test pipe. That would easily pass visual inspection.

 

good idea..i'll try that... the pipe is 80mm..im not sure if it fits..but i'll try it

 

I have a UR HFC gutted out 10 % for even more flow. it looks like one of those stock cat on normal cars. It even has slight rust on flanges just like stock cat. and keep your stock cat for later state inspections. you can buy mine and gut out 100 %.
I will sell you cheap. 60 dollars shipped if you want.

 

All this time driving in chicago I've never been pulled over and "inspected" to see if I had a cat. Hell for a couple months I was driving my 2g dsm around with no front bumper and only a fmic; a ton of cops saw me and non of them cared.

 

As long as your car does not Throw "Check Engine soon", you are fine in Chicago. Emission test only takes 5 mins to be completed. No1 will stop you and inspect whether you have a cat or not.

That's what happened to my Bro's Eclipse.

 

Had my mustang pass emissions with h pipes with no cats, loud as hell. all they do in chicago is an OBD test, no CEL, its all good. dont worry about a HFC.

 

in Nevada, if you have a CEL you fail no matter what. thank goodness my dad owns 3 smog machines >_<

that doesn't matter. im 100% legit.

 

Thanks will do it myself too.




thanks

 

I dont mind smog check as well, in LA $35 = pass smog check. friend of mine passed his smog with broken tail light LOL




just worried about cops pulls you over and blah blah blah

 

I personally performed back to back testing on a dyno going from a test pipe to a high flow cat. At the same boost pressure I saw a drop of 10 HP at the wheels on a dyno dynamics chassis dynometer.

Keith

 

The smell alone is horrible. It would definitely attraction more attention. Or if you have roadside smog machine like in california, youll be in big trouble.

 

how many people have a cat delete pipe without a tune. pros and cons thanks.