invidia gemini CBE with Megan test pips
 

Hi guys ,
I have small doubt ,when I bought my car it had megan test pips and last week I installed invidia gemini CBE .The sound now is loud and in our country its illegal .I am thinking to change the HFC to AAM or invidia HFC will that help to reduse the loudness ?? i need the power gains with out loud sound

In my experience the sound difference between test pipes and high flow cats is not a huge difference, test pipes are a little louder. Are the test pipes resonated? And is there a resonator in your midpipe? Probably is but if not you can get a resonator welded in and it will reduce the sound a little bit but not much.

Hey,
I guess the filter is removed from my test pips... And yes there is a mid pip I got the full kit from invidia

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What filter? There's no filter on those. I have no idea what you are referring to. That, and what are you asking us? Power gains without loud sound? What can make is quieter? What are you asking?

HI,

What I mean by filter inside the megan hfc like in the photo. An am not into a loud sound all what I need is to increase the hp thats why I replaced my CBE. So my question here how to reduce the loudness of my CBE https://uploads.tapatalk-cdn.com/201...a40d6377b6.jpg

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You will need either HFC (hp increase over stock cats) or resonated test pipe (hp gains over HFC) youre gonna be lounder over stock no matter what aftermarket exhaust u go with.

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Out of all the HFC’s you listed I would opted for the AAM HFC’s. No matter what aftermarket exhaust you install it will be louder the only exhaust that will probably be only a little louder than the stock exhaust would be the Nismo exhaust. If you are looking to drastically tone down your 370Z you will have to install aftermarket HFC’s or the stock Nissan catalytic converters. Test pipes resonated or not will be quite louder. In your country what db sound from your exhaust is considered to be legal?