I've been shopping around for a high-flow cat because my is so clogged up, i wanted to revive a couple HP. I ran a straight pipe in my old exhaust set-up which was a Greddy EVO II and it didnt sound all that great, a little ricey at mid-RPM :/ .. im now running an Apexi N1 full cat and was wondering if anyone was pleased with a certain brand of high-flow cats or if it even mattered? can i shop on ebay and get a $50 one with the same quality a san expensive one? will my car go back to sounding like ***?? thanks!

 

just any replacement really. i read an article that tested the difference between a stock cat, high flow cat and a test pipe and the difference was only 1-2hp. and that much can vary just due to temp so cant really say it was due to the cats themselves.

 

SMSP

 

ur thinkin of running a test pipe with an N1? its gonna sound a lot more ricey than it did with ur evoII.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by nonvteclude &raquo;</TD></TR><TR><TD CLASS="quote">just any replacement really. i read an article that tested the difference between a stock cat, high flow cat and a test pipe and the difference was only 1-2hp. and that much can vary just due to temp so cant really say it was due to the cats themselves. </TD></TR></TABLE>
i also read that article in honda tuning, the test pipe put out the most power if i remember correctly. however its a miniscule amount of power plus its not gonna pass emissions.

ur better off gettin a good high flow cat such as a carsound(made by magnaflow)

 

https://honda-tech.com/zerothread?id=1848540

 

your car will most likely throw a CEL for the highflow cat, i reccommend getting a defouler, i can hook u up, pm me for details...

 

Well the tree hugger in me says go get a regular cat, but to solve your problem I think you need a resonator. That'll help cancel out some of those high pitched high freq raspy ricer sound waves in your exhaust. What size diameter piping are you running with the N1?

N1 + at least a 14" resonator = my fav sound ever.

 

y do people dig up threads that r almost a month old for no real reason? throw a code for a highflow cat? nooooooooooo dont think so. ive had a highflow since the 2nd week ive owned my car and it never threw a code. neither did my last car, or my brothers car, my brother in laws car...nor any of my friends. so idk where u come up with that crap...if u wanna sell ur stuff try the forsale thread

 

I got a carsound cat from http://www.kteller.com

I have mated it with a 2.5 exhaust...I love it. One of the best upgrades!

 

same setup i have. carsound highflow, 2.5" mandrel bent piping...never had a cel bc of the cat...EVER

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rawNAprelude &raquo;</TD></TR><TR><TD CLASS="quote">same setup i have. carsound highflow, 2.5" mandrel bent piping...never had a cel bc of the cat...EVER</TD></TR></TABLE>

me either...

2.5 carsound cat, 2.5 piping, 2.5 magnaflow oval muffle. nice deep sound, no CEL's

 

stock header(for now...ill either get one sometime during the spring or when i get home from iraq most likely), 2.5 carsound cat, 2.5 piping, 2.5 borla muffler = a lil loud but deep

 

mmm go big or go home...

oem spec cat or straight pipe

not like it matters, you're in florida...you guys don't get smog tests correct?

 

im in new york

 

I was referring to the OP's location, not yours

 

oh, well u replied to me so i obviously thought u were askin me nm than

but as far as i know, iirc, ny doesnt test for smog. just hydrocarbons, co2, and nox(nitrous)

 

rawNA: u dont have problems with inspections with the high flow cat? do u have the egr removed or no?

 

nope no problems, egr not removed

 

Just a side note, on my g/f's old car she passed emmisions here in Colorado, which is fairly strict, with a pipe through her cat. I put mine on my car for etest and it super clean/fast passed. I should have left my resonator on to see if it had passed first.

 

what exactly is a test pipe compared to a cat?
and where does a resonator go on your exhaust?

 

i went with a high flow Catco 2.5" cat on my lude and it works great... im running a 3" version of it on my Sr20DET G20...