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Unread 10-31-2015, 09:57 AM   #1
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Question Exhaust help

Hi all

I have a 2006 mazda mx5 2.0l and i have a 'problem'

i currently have a 4-1 decat manifold - 200cell cat on the midpipe resonated - cobrasports backbox.

the backbox makes a brilliant amount of pops and burbles but is just too loud, it was just about bareable before i changed the header but since then the dB is ridiculous, i still love the tone/note and pops are even better but its not suitable for normal driving.

So here's my question, what properties of a backbox causes it to pop and burble?
as theres no real space to add more resonators or j-pipes my my best bet is a custom backbox, but most customs ive heard sound quite cheap, almost tinny and very smooth, no pops.

Or are the pops always there but not noticeable until the exhaust gets louder?

any tips/advice or even suggestion for exhausts would be great.

I'm about to change back to the standard silencer as this runs a good type of noise level until i find the one i want.

heres a video of the exhaust before i changed the manifold - https://www.youtube.com/watch?v=HsX6BD7Tz30

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Unread 11-02-2015, 10:07 AM   #2
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The video doesnt make the car sound very loud, my car i think is much louder... But anyways, A very free flowing, larger diameter exhaust will pop and "burble". More baffling in the muffler will reduce this so if you want a quieter exhaust tone, change the muffler or catback you have to something more tame.

I dont know off the top of my head what exhausts you should look at for the MX5, but i know there are very many options available. Youtube vids are usually a big help, and meeting locals at car meets and seeing/hearing what they have may help to narrow it down for you.
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Unread 11-22-2015, 01:31 PM   #3
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Quote:
Originally Posted by pbasil1 View Post
The video doesnt make the car sound very loud, my car i think is much louder...
i think its louder from inside the car, cabin drone etc. asside from cheap ebay catbacks and short cans thats about the loudest exhaust you can get for the car., i think quite unanimously agreed amongst owners, but its also the best sounding aside from the Larini system which is out of production and thus very rare to go on sale, and that is very loud as well.

for now ive switched back to the standard silencer and i actually quite like the sound, with the decat manifold its much more aggressive than the stock car but its still and ugly thing so ive decided to go for a custom, probably from MIJ perfomance (walsall) have them fabricate a quiet exhaust, sacrifice the pops and enjoy the comfort of not going deaf on a long journey, as well as having a nice visual

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