NC Exhausts/ manifolds

[monte5]

Ok - For you NC' ers - I'm interested to hear what experiences people have had fitting performance headers and what sort of improvements they noticed even running with stock mid pipes and mufflers. OR has anyone just upgraded the muffler and what was the result? (apart from the obvious increase in noise!)

[PUR157]

http://mx5cartalk.com/forum/viewtopic.php?f=57&t=29497&p=477699&hilit=exhaust#p477699
the 2nd post should be helpful!

I'm only an aspiring NCer so I'm just regurgitating some stuff I've read...

[CoffeeBoss]

Was going to start my own NC Exhaust Thread since there isn't really one that i can find, only this thread about extractors for the NC that disintegrates into the usual debate about the validity of exhausts and dynos and what not.

Moving right along: i have been doing some research on the various aftermarket options for exhausts for the NC. For the record, the only real benefits i am after are:

1. lighter muffler (the NC's muffler weighs, according to Goodwin Racing, 26 pounds/12kilograms), All of Goodwin's options are lighter.
2. improved throttle response - from driving a few of Chris/MX5 Racing's NC race cars, i know i can expect a small but noticeable improvement in throttle response.

Yes, with breathing and exhaust modifications this opens up a little more hp according to a number of dyno claims ( if you want more, start here, and better still, ECU tuning becomes more worthwhile, however that's neither here nor there, as things like improved throttle response and a nicer tone are things i can feel from the drivers seat immediately.

Noise-wise is the only bug-bear for me as i'm after something that isn't going to be overbearing at 3000rpm on the freeway, but provides a bit more bark on wide open throttle. For all these reasons i expect i will lump for one of Goodwin Racing's options.

[CoffeeBoss]

Goodwin Racing:
RoadsterSport II Stainless Steel Duals - Goodwin Racing's most popular exhuast, 7 pounds lighter than standard, ~8hp max power gain, 15% - 25% louder than stock depending which baffles you use (there are two types to choose from).




RoadsterSport RACE Muffler - this puppy has two clear advantages - only 7 pounds in weight, and it's very cheap! It's a single system (only one pipe out the back) which for some will be more suited to the MX5, for others will not look as good as twins.



Goodwin can also source:
Racing Beat: same weight as stock, approx 15% louder than stock. Probably a good choice for someone wanting a bit of muffler 'bling' this has a nice chunky look to it.



RoadsterSport "Q" Stainless Steel - the Quiet choice, about 10-15% louder than stock, Brian Goodwin recommends this for those intending on doing headers and midpipe as well.

Since one man's too loud is another man's too quiet, here is how each of our Miata exhaust choices ranks in terms of sound level: the Racing Beat is about 15% louder than stock and very deep sounding, the Magnaflow comes in about 15-20% more sound than stock, our RoadsterSport II Duals is actually adjustable for a range from 15 to 25% more sound than stock depending on whether or not you use the included baffles or the optional packed silencer baffles, and MazdaSpeed ranks about 30% more sound than stock with a little more low end boominess. The RoadsterSport RACE single tip Miata exhaust is about 50% more sound than stock. For those planning a header or supercharger we strongly suggest our newer "RoadsterSport Q" design which is only about 10% more sound than stock.

Also found this page for the *ahem* XS-Speed Mk3 Fusion high performance twin exhaust system.

http://www.xsspeed.co.uk/fusion.php

This system is being used by @ndrew and sounds fantastic: HKS Legamax
http://www.hks-tv.com/watch/?watch=16&tabsnm=

[CoffeeBoss]

So, the long and short of it all is that judging the sounds and tone of an exhaust is all very objective, and apart from the few people that bother to record the sound of the exhaust from in their car going along, videos don't always help much either. So looking for NC owners to contribute their own thoughts on their exhaust choices, and what they like or don't like about the sound etc.

Thus making this a more useful thread for other NC owners!

[@ndrew]

This system is being used by @ndrew and sounds fantastic: HKS Legamax
http://www.hks-tv.com/watch/?watch=16&tabsnm=

HKS FTW!!

[philz]

RE amemiya, pitcrew racing, fujitsubo, jet's integral, autoexe, just to name a few...

[CoffeeBoss]

The venerable BlueMeany from the US has done this video highlighting the 3 stages of exhaust available from Goodwin and how they all sound. Trawl through his videos, there's plenty of worthwhile viewing there for NC owners thinking of shopping with Brian Goodwin

HKS FTW!!

*ahem* we've discussed this Andrew, perhaps you could be a little more eloquent?

RE amemiya, pitcrew racing, fujitsubo, jet's integral, autoexe, just to name a few...

Hey Philz, i know they are out there, looking for worthwhile reports or, better still, video of these examples. I for one have always been a big fan of Fujitsubo's exhausts.

[CoffeeBoss]

HKS Legamax Premium (stationary)



Autoexe exhaust - acceleration and slow drive by at beginning of this video. It should be noted that i think this car also has the Autoexe clutch and flywheel combo.

[philz]

Jet's integral kobe:
Clubman:
http://homepage1.nifty.com/integral_kob ... V04678.MPG



N-zero- single side
http://homepage1.nifty.com/integral_kob ... V04677.MPG





Re-amemiya dolphin exhaust: (mpeg files)
http://www.re-amemiya.co.jp/sound/downl ... cec_muff_2
http://www.re-amemiya.co.jp/sound/downl ... cec_muff_3
http://www.re-amemiya.co.jp/sound/downl ... _muff_1run

Beautiful, just beautiful.

[philz]

Pit crew racing:

Pitcrew header vs OEM


Yum:

[@ndrew]

HKS FTW!!

*ahem* we've discussed this Andrew, perhaps you could be a little more eloquent?

Yes i'll be posting up pictures in build thread!

[@ndrew]

Also don't forget the rest of the HKS exhaust system

[CoffeeBoss]

That HKS system looks AWESOME. Any dyno numbers? What do you have to do to the ECU to fit that? All I have at the moment is the Autoexe muffler and thats a work of art. Sounds great to boot. Deep and low, fractionaly louder but freer reving.

It is a complete system which you can also source from Goodwin Racing. The most popular Goodwin Racing setup being the Goodwin Racing headers, mid-pipe and 'Q' muffler.
Some then go with an ECU piggyback and tune (Sniper or XEDE seem to be the only choices available at the moment) however this isn't necessary. But will give you a slightly higher max HP if that's what you're chasing.

ODULA Dual Muffler




Sound files (not sure what the two differences are - possibly standard VS. Odula duals):
http://www.odula.com/sound/nc_muf.MP3
http://www.odula.com/sound/nc_kara.MP3

ODULA Single Muffler



(that's the Odula rear bar you can see in this shot)

Sound file:
http://www.odula.com/move/od.MP4

[CoffeeBoss]

GReddy USA sell a single sided muffler for the NC:




Some specs on the 5zigen Proracer twin muffler for the NC:
(taken from 5zigen Japan website)



Product weight - 12.0kg
Genuine muffler weight - 11.4kg
(so it's heavier than stock!)

Here's some Japlish style translation of the 5zigen sound measurements for this muffler: