I have a RMR downpipe and exhaust. But the downpipe uses the stock cat. I would much rather get a test pipe but this is my daily driver and I am worried about not passing emissions. Are the power gains that much better in a test pipe than a High flow cat. Do they even check for the cat anymore?

 

yes if you have emissions testing they do look for a cat atleast for me they do in PA, not sure on MD laws......but you can always swap back and forth, its only once a year

test pipe will yield a couple extra ponies over a highflow, imo not worth the hassle of swaping back and forth or defying emissions, but thats just my $.02

 

Will a hiflow cat pass emissions?

 

lets keep the air clean for our children people.

 

no keep the air clean for yourself... running a test pipe will make you nauzeated. every time you come to a stop if you have the windows down your exhaust will catch up to you. happy breathing :\

 

Well, I will tell you from absolute first hand experience. I have a Greddy Evo catback, Turbo XS down pipe and had a UR hf cat on . The gain's were good with the HFC, but I had the UR test pipe put on this weekend. What a huge difference, the power is really felt. The car actually seems to run a hell of a lot better. No CEL's or check engine lights either.

 

Which test pipe did you get and are you worried about emissions

 

we don't live in cali where you don't get very much wind.

 

Test pipe

 

Run the test pipe and just switch to the stock cat pipe when it comes to emissons time.

 

I've never had this problem. The cars behind you, however, will get nice whiffs when you give it the go-pedal.

 

I had the UR HFC and i also have a test pipe. Big difference with test pipe and also louder exhaust. When it comes time for emision tests then i will swap back to the HFC.

 

I had a magnaflow high flow cat and put down 320 to the wheels. A week later I swapped out the hfc for the buschur cat delete pipe and ran 332. I think 12 horse to the wheels is worth the hassle of swapping out the part if needed for emissions testing.

Just my two cents.

 

Test pipe.

 

pop quiz pipe