I've installed my kamikaze headers & downpipe today.

My problem is that when i get over 3k rpm, it sound like civic... lol. Like if i had an vtec at 3k.

But lower than 3k, the sound is loud and awesome, so if i get a resonator + new high flow cat + Dynomax VT.
Would it help getting louder?


Resonator = Test pipe? Or im wrong

 

The sound you're hearing over 3k is very common on our cars.
I had it and here is my two cents;

I found that the flange gasket was not sealing tight enough and needed to be replaced with a thinker one.
I could clearly see carbon streaking on the old gasket once off.

I would assume this is your "civic" sound as well.

It is just enough that it creates a exhaust leak when under high load.

 

mci - question do you have the part number for the exhaust gasket or could using two gaskets work as well or no??

 

get a resonator it should lower the sound, but thats because your N/A the sound travels through hollow pipes, with a turbo it reduces the noises while creating power. If you get a resonator with your setupit will make your idle alot quieter as well as upper rpms. It also depends on the muffler you have as well I had a magnaflow which was stuffed very well reducing noise as well as not robbing the power.

so your choices is new muffler or resonator as your cat/test pipe

 

I don't remember it.
I just took my old one to a parts store and matched it up to a FelPro.

 

On my old setup I had the header , test pipe with stock exhaust . It actually felt faster than with a greddy exhaust and magnaflow .

 

which gasket you talk about? Header to head, header to downpipe or downpipe to the cat?


I've got the Ractive fireball muffler + Racing cat ( What was wrote on the box.. lol ) it mean high flow?


Someone told me that might be the downpipe was making this sound

 

because its been installed yesturday, i dont think it come from a leak...


I was thinking about the Dynomax VT 2¼ inch.

 

I'm talking about anyone of your 2 hole flange gaskets.
They are notorious for leaking if they are not thick.

Could be wrong but if what you are hearing is a fast popping sound at high rpms then that's what it is.

 

The header is what gives you that "ghey" civic sound. I'm assuming it's an equal length header?

 

Ya its 2.5 header and downpipe size, and my catback is 2¼...

 

try getting a highflow cat installed on your setup. if helped with the sound when i put in headers/downpipe on my car when it sounded like a jetengine at idle

 

Well i changed the muffler recently, it sound lot quieter.

What i exactly got is : Kamikaze header (2½) + downpipe³(2½) + Racing Cat(2½) + Custom 2¼ catback and a dynomax muffler VT.

The sound doesnt sound bad on idle and rev it, but when i put gear and move, it sound acute in a certain rpm range and Throttlebody full open it sound worse.

-Adding resonator would only make less noise and add more resist? right?

-Using stock downpipe would change something? About the sound and power?

-Ill try to get high flow cat from magnaflow and see..


THNX ALOT for you help! im despair lol