test pipe/cat converter question

[skuurtin s13]

just wondering whhat size an oem cat is because im going to purchase a test pipe and am matching it up with my hks hi power catback so will a 3" test pipe work for me?

[PEZi]

what size is the catback? make the test pipe the same size... simple as that

[skuurtin s13]

im guessing its the same size as stock because everything fits flush, i can only find 3" test pipes and im thinking i have 2.5" piping

[Shabbernigdo]

just wondering whhat size an oem cat is because im going to purchase a test pipe and am matching it up with my hks hi power catback so will a 3" test pipe work for me?

if u are running stock n/a set up keep the cat. test pipes make the car more sluggish and it sounds like crap.

[skuurtin s13]

the cat has holes in it and the flanges are f***ed up

[gumby74]

I picked up a 2.5" resonated Megan test pipe off Ebay for something like $30. Looks good, fits great, and with my Blitz exhaust is actually not any louder than with the stock cat. Keep in mind I am running a header, so that is where the majority of my noise is generated.

[gumby74]

And no, the test pipe does not make the car more sluggish. You can feel distinctly more pull in the mid range.

[skuurtin s13]

well can somone tell me if the test pipes on enjuku fit as if it was a stock catalytic converter

[gumby74]

If it comes with the flanges welded on, it should be simple bolt on affair.

[skuurtin s13]

yah im wondering if those flanges match up to stock ones i emailed enjuku but havent gotten a response

[heartofaskyline]

3in test pipe flanges are not the same as the stock cat.

[lay-N-low S13]

I got the ISIS 3" test pope from enjuku and it was a perfect fit to the stock pipeI don't get why people are saying it won't fit. It's 3" inches but at both ends it comes down like short funnels and fits good to the stock pipe. Hope this helps new studs and bolts come with it too.

[OM3GA]

3" will work for sure, i had one.

People are basically saying to keep the piping the same size but the flanges will always be the same. Unless the piping is like HUGE for no reason. Get a 3" it will fit fine. I like the Circuit sports one because the flangers are thicker than a few other companies. Anything will work though.

Mine was made of thin material and it got so hot at high rpms that it would melt my shoe to the floor of my car, it sucked when i went to brake and realized i couldn't lift my foot. Try to find either a resonated one or one made of a thick material lol my $25 ebay special wasnt the best haha.

[nifares240]

hey buddy...you got the exhaust. run it with a 3 inch test pipe. if you want rumble, use the resonated ones. this will make your idle quiet as well. if you want more throat sound, use the straight, no resonator. enjoy. post pics once you have it up on the car.

when I had that exhaust, my car never ran sluggish. i tell, use a damn test pipe and call it a day.
Modified by nifares240 at 9:56 PM 12/14/2009