MX5parts exhaust and decat questions
Discussion
Hi guys,
I am going to be buying the MX5parts (single exit) stainless exhaust to give my car a bit more character and make it a bit more free-flowing.
I was also considering a silenced de-cat pipe (which is out of stock for the 1.6 on mx5parts, typical
) but was wondering what the noise implications of this are, and whether it's worth doing?
Does anyone have the above combination, either with or without a supercharger who can offer any comments (or videos/sound clips!) - more importantly when cruising as I like noise when hooning but I don't want a horrendous din at motorway speeds.
Thanks!
I am going to be buying the MX5parts (single exit) stainless exhaust to give my car a bit more character and make it a bit more free-flowing.
I was also considering a silenced de-cat pipe (which is out of stock for the 1.6 on mx5parts, typical
) but was wondering what the noise implications of this are, and whether it's worth doing?Does anyone have the above combination, either with or without a supercharger who can offer any comments (or videos/sound clips!) - more importantly when cruising as I like noise when hooning but I don't want a horrendous din at motorway speeds.
Thanks!
I've got an MX5Parts twin pipe + Moss silenced decat on mine, and it's still pretty loud when accelerating, certainly very loud compared to the standard pipe. I never tried the pipe with the cat so no idea what that's like, but I did try an unsilenced decat and it was like being on a bombing run, epically loud and not all that pleasant.
The silenced decat + stainless pipe makes a lovely sound, with the occasional pop when coming off the power, but you just have to be aware and drive like a granny when you're in a built up area so as not to annoy anyone.
Just noticed you asked about cruising - my twin pipe is a bit boomy at motorway speeds, so I normally end up at about 55 to 60 enjoying the fresh air and the view - if you have to get somewhere on time every day travelling at 60 to 70 for a while then it would probably become annoying. Might be worth retaining the cat in that case which I would expect to reduce the boominess.
The silenced decat + stainless pipe makes a lovely sound, with the occasional pop when coming off the power, but you just have to be aware and drive like a granny when you're in a built up area so as not to annoy anyone.
Just noticed you asked about cruising - my twin pipe is a bit boomy at motorway speeds, so I normally end up at about 55 to 60 enjoying the fresh air and the view - if you have to get somewhere on time every day travelling at 60 to 70 for a while then it would probably become annoying. Might be worth retaining the cat in that case which I would expect to reduce the boominess.
Edited by anonymous-user on Tuesday 22 March 14:51
Before you fit a new backbox, why not get a custom mid-pipe made up, with as large a silencer box in it as will fit and see how this affects the noise?
A decent exhaust fabricator should be able to make one up that will mean you can swap your cat in and out for the MOT with ease too.
That way you get a freer flowing exhaust with reasonable sound levels and if it's not loud enough you can then move on to the back box.
A decent exhaust fabricator should be able to make one up that will mean you can swap your cat in and out for the MOT with ease too.
That way you get a freer flowing exhaust with reasonable sound levels and if it's not loud enough you can then move on to the back box.
I think Don Phil has bought the Cobalt...?
On the whole, I agree with Jim.
I have a Fujitsubo manifold, MX5parts Silenced decat and the MX5parts single exhaust.
It sounds great, but it is pretty loud at 70+mph.
Things to consider though -
- Superchargers make things louder
- I've also run this setup with the Catalyst in and its a chunk quieter
- My manifold is probably contributing to the noise a fair bit.
- IMO the Mx5parts exhaust is fantastic value, especially as there often on sale/on ebay. Compared to what people pay for exhausts on other cars by Miltek etc. Well made, guaranteeds, comes with all the bolts etc, fits right on easily.
- Depsite being LOUD, its a sportscar, its fun, so what. Hardly the last word in refinement. Flames come out too sometimes, so its a worthy compromise
And I drive mine on the motorway everyday.
On the whole, I agree with Jim.
I have a Fujitsubo manifold, MX5parts Silenced decat and the MX5parts single exhaust.
It sounds great, but it is pretty loud at 70+mph.
Things to consider though -
- Superchargers make things louder
- I've also run this setup with the Catalyst in and its a chunk quieter
- My manifold is probably contributing to the noise a fair bit.
- IMO the Mx5parts exhaust is fantastic value, especially as there often on sale/on ebay. Compared to what people pay for exhausts on other cars by Miltek etc. Well made, guaranteeds, comes with all the bolts etc, fits right on easily.
- Depsite being LOUD, its a sportscar, its fun, so what. Hardly the last word in refinement. Flames come out too sometimes, so its a worthy compromise
And I drive mine on the motorway everyday. TBH I use it for fun only so I'm happy for some noise, like you said it's fun I just don't want my ears to bleed after maybe an hour on the motorway.
Currently thinking Cobalt exhaust, but debating whether to de-cat or not. Seems like the right thing to do, remove any unnecessary restrictions
I just don't want my ears to bleed after maybe an hour on the motorway.Currently thinking Cobalt exhaust, but debating whether to de-cat or not. Seems like the right thing to do, remove any unnecessary restrictions
snotrag said:
I think Don Phil has bought the Cobalt...?
On the whole, I agree with Jim.
I have a Fujitsubo manifold, MX5parts Silenced decat and the MX5parts single exhaust.
It sounds great, but it is pretty loud at 70+mph.
Things to consider though -
- Superchargers make things louder
- I've also run this setup with the Catalyst in and its a chunk quieter
- My manifold is probably contributing to the noise a fair bit.
- IMO the Mx5parts exhaust is fantastic value, especially as there often on sale/on ebay. Compared to what people pay for exhausts on other cars by Miltek etc. Well made, guaranteeds, comes with all the bolts etc, fits right on easily.
- Depsite being LOUD, its a sportscar, its fun, so what. Hardly the last word in refinement. Flames come out too sometimes, so its a worthy compromise And I drive mine on the motorway everyday.
would you recommend the fujitsubo manifold? would it make any noticeable increase in performance/ sound to a standard exhaust? also where do you get them from and how much? noticed that steve at 5speed is the flyin miata importer now for the uk..was wondernig how much a racing beat manifold would be.. after import taxes etc an whether its worth it..On the whole, I agree with Jim.
I have a Fujitsubo manifold, MX5parts Silenced decat and the MX5parts single exhaust.
It sounds great, but it is pretty loud at 70+mph.
Things to consider though -
- Superchargers make things louder
- I've also run this setup with the Catalyst in and its a chunk quieter
- My manifold is probably contributing to the noise a fair bit.
- IMO the Mx5parts exhaust is fantastic value, especially as there often on sale/on ebay. Compared to what people pay for exhausts on other cars by Miltek etc. Well made, guaranteeds, comes with all the bolts etc, fits right on easily.
- Depsite being LOUD, its a sportscar, its fun, so what. Hardly the last word in refinement. Flames come out too sometimes, so its a worthy compromise
And I drive mine on the motorway everyday. JimSuperSix said:
I've still got the unsilenced decat pipe around somewhere if anyone wants to try it out, way too loud for me and so was only on the car about a month.
I will buy this off you if you could send it my way, am about to get one from eBay, how far away are you and how much would you be asking for? Hi
I've been running the silenced decat with the Mx5Parts single exit s/s exhaust (on the standard manifold) for about 7 months now and I love it! Pottering around you just get a nice burble and you get a real howl which starts at around 4k rpm, and you get a nice muffled popping on the overrun. Of course this is also around motorway speeds too in top gear but I don't find it that intrusive, and it's my daily runabout. I imagine with the straight through unsilenced pipe it would be a much sharper/harsher noise.
I put these on at different times so felt the benefit separately. Decatting the car certainly felt that it gave the better performance improvement, a noticeable jump in the midrange, mind you with your s/c doubt you'll notice it
.
There's a Mazda meeting down at the Ace Cafe tonight which I plan on going to so if your in the London area I can take you for a spin.
Andy
I've been running the silenced decat with the Mx5Parts single exit s/s exhaust (on the standard manifold) for about 7 months now and I love it! Pottering around you just get a nice burble and you get a real howl which starts at around 4k rpm, and you get a nice muffled popping on the overrun. Of course this is also around motorway speeds too in top gear but I don't find it that intrusive, and it's my daily runabout. I imagine with the straight through unsilenced pipe it would be a much sharper/harsher noise.
I put these on at different times so felt the benefit separately. Decatting the car certainly felt that it gave the better performance improvement, a noticeable jump in the midrange, mind you with your s/c doubt you'll notice it
. There's a Mazda meeting down at the Ace Cafe tonight which I plan on going to so if your in the London area I can take you for a spin.
Andy
I've had to run my car with the SC bypassed (belt of, bypass tied open) a few times and to be honest the exhaust volume isn't any different. In fact if anything it's noisier without the SC as more throttle is needed to make progress! Might be different with an MP45 but I don't see why that should be.
I've heard a Mk 2 fitted with an MP62 and a gutted oem cat and standard back box and it sounded only very slightly louder than standard.
If you read the blurb for some of the US decatted midpipes though (Racing Beat/FM?) - it specificially states not to use them with an SC due to noise though.
If you read the blurb for some of the US decatted midpipes though (Racing Beat/FM?) - it specificially states not to use them with an SC due to noise though.
JimSuperSix said:
I've got an MX5Parts twin pipe + Moss silenced decat on mine, and it's still pretty loud when accelerating, certainly very loud compared to the standard pipe.
Do you mean the decat pipe makes the twin pipe backbox noticeably louder or that the decat + twin backbox is noticeably louder than the standard exhaust?The standard exhaust on my 10AE was silent; I couldn't hear it at all whilst driving.
youngsyr said:
Do you mean the decat pipe makes the twin pipe backbox noticeably louder or that the decat + twin backbox is noticeably louder than the standard exhaust?
I've not tried the twin pipe without the decat, so I don't know how much the cat quietens it down, but the twin pipe + decat is much louder than a standard exhaust.Jamlar said:
I will buy this off you if you could send it my way, am about to get one from eBay, how far away are you and how much would you be asking for?
Just dug it out of the garage, and it looks a bit more used than I remember (you'll need to give it a wirebrush on the flanges and scrape off the old gaskets), so it's yours for the cost of postage if you want it. It will be coming from Fife.If you want it PM me your address and I'll get it weighed at the post office and let you know the postage cost.
JimSuperSix said:
youngsyr said:
Do you mean the decat pipe makes the twin pipe backbox noticeably louder or that the decat + twin backbox is noticeably louder than the standard exhaust?
I've not tried the twin pipe without the decat, so I don't know how much the cat quietens it down, but the twin pipe + decat is much louder than a standard exhaust.Scho said:
these are f
king loud.
It's all a matter of opinion. I've heard a few with this setup and while they are noisy they aren't as loud as mine and I don't consider mine to be too loud at all. Try to hear the setup yourself 1st hand an make your own mind up rather than just accepting the opinions of others as we are all different.king loud.It has to be said that one man's loud is another's reasonable. I had a titanium exhaust on my other car that measured 102dB static at only 4,500 rpm - that's too loud for some track days and can be damaging to hearing, without the engine even being loaded!
I believe a "normal" exhaust volume is around 89dB under the same conditions and I would generally consider anything above 95dB under the same conditions loud, but others would probably find just 92dB or 93dB to be a loud exhaust.
My god titanium exhausts sound good though:
http://www.youtube.com/watch?v=Z853QwGyJ-Q
I believe a "normal" exhaust volume is around 89dB under the same conditions and I would generally consider anything above 95dB under the same conditions loud, but others would probably find just 92dB or 93dB to be a loud exhaust.
My god titanium exhausts sound good though:
http://www.youtube.com/watch?v=Z853QwGyJ-Q
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