just a quick question, for a high flow cat, it doesnt matter if your header and exhaust piping is 2.25'' or 2.50'' right? I just bought a generic high flow cat from ebay, and i am wondering what the result will of that...i hope it wont be too loud. Thanx

 

i bought one of ebay too. it didnt fit 3 inches too short and is quite loud. cost me more to put it on than it did to buy. hope yours works better

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by petergriffen &raquo;</TD></TR><TR><TD CLASS="quote">i bought one of ebay too. it didnt fit 3 inches too short and is quite loud. cost me more to put it on than it did to buy. hope yours works better </TD></TR></TABLE>

You probably just bought a resonator. If it is the crappy ebay ones for $40, it is nothing more than a resonator. Trying to make a real, functioning cat with $40 is impossible.

 

i bought the cat on ebay for like $10 but the shipping was $18 it has the o2 sensor slots

 

i got a cat from ebay and i have had it for a year and never had problems, not bad for 25 bucks

 

i tried to install my cat, and i found out that the side to connect the cat and the header was welded on sideways. I had to go take it to a muffler shop and pay like 35bucks to have it cut and welded back on. I guess that is what you get if when you pay 10bucks for one on ebay. well ne ways, everything seems fine, the car got a little louder, and it smells like rotten eggs when i stop at a light. It feels a little more responsive, other then that I cant really tell of any HP gains.

 

buy mines: 45 shipped

3" to 2.5"

 

Everyone here seems to have hi flow cats confused with testpipes. Or is that what you were looking for?

 

yea that is a test pipe, but i have a cat that kinda looks like one

 

The cat (or test pipe, whatever) the flanges were welded sideways for a jdm itr header i bet Atleast i know my header was sideways so i welded on my own flanges. Much easier that way

PS, get a carsound hi flow. Very impressive, good flow and quiet. 2.5" is the way to go for mild build NA

 

its supose to be a test pipe...a friend brought one from ebay.....for his gsr and it works pretty good.....makes more power in the high end....also a little bit loud due to the straight pipe......