Aftermarket Exhaust

[TieNN89]

Thanks AJ

I heard good things about them too which is why they were the first for me to call

Apparently they've done a few MX-5 lately

Oh BTW I'm not getting paid out 2k I have up to 2k for an exhaust which the insurance will pay direct

[manga_blue]

Loch Stewart (aka Garry) do a full system of headers, hi-flow cat and the rest which are proven performers on naturally aspirated NAs and NBs. They are a well known set-up. Cost should be a lot less than $2k.

Even if you don't eventually buy from him it's worth at least sounding him out first. Contacts details Brisbanites?

[TieNN89]

Has anyone used Midas? the one at Woodridge on Kingston Rd

My MX-5 is going there for suspension work and they do exhausts etc

[Steampunk]

I don't know Gary Stewarts' number (I thought I had it), but Novice1 (Ron) does, send him a PM.

The \"Loch Stewart\" headers are made by CES Racing by the way, down Beenleigh way. From what I gather, custom exhausts don't get much better, so if you can use up to $2000 may as well go there. I would.

[TieNN89]

I don't know Gary Stewarts' number (I thought I had it), but Novice1 (Ron) does, send him a PM.

does he own a performance shop or something?

PM sent to Novice1

[RG.net]

i would say buy mine (naturally) but if the insurance company is willing to pay out 2g then get 2.5 inch piping, high flow cat, 4-1 extractors and a nice tip. oh and to get as close to 2g make it stainless steal

[TieNN89]

mmm

whats the difference to what ever they normally use to stainless steal?

[blehbear]

Wouldn't a 4-2-1 header system be better for the mx5s as it helps improve torque throughout the whole rev range?

[16bit]

i have the loch system. It gave me 87rwkw with a k and n typhoon intake. the headers are manufactured by ces and they are fitted by rob bliss exhausts.

[stevesports]

re: Cat, make sure it is a high flowing one. Also i would recommend you spend a little more on your headers for a high quality one. They are very important. Overall sounds like an OK price.

The guy said a high flow one isn't really worth it since mines just N/A 1.8L so he said the bigger cat would work

Headers they custom make it so I'm not sure how to figure out whats high quality and whats not

usually the bends and quality of the welds. IIRC you would want equal length pipes from the engine to the cat. also i would recommend 4-2-1 to maintain torque, however i believe a 4-1 system would be great for outright power. I prefer a beefy torque curve but that's just me.

re: stainless steel. It is more durable than mild steel. In addition, a stainless steel system would sound different compared to mild steel. A bit more raspy.

[Steampunk]

mmm

whats the difference to what ever they normally use to stainless steal?

Pardon?

If you mean, what else are exhausts made out of besides stainless, then short answer is mild-steel.

Difference is, obviously, longevity; other difference is sound. Given 2 identical exhausts, stainless will make a high-pitched/tinnie sound, mild will give a deeper/droning sound.

[manga_blue]

... or you can combine the two for the best of both.

The need for stainless increases towards the back where things are not as hot and there's more risk of moisture condensing there and rusting it out from the inside. So a stainless muffler and tailpipe are good.

Rust is rarely an issue up front, so that's a good area to use mild steel for low cost and better, deeper sopund.

4-2-1 headers usually gives a wider spread of power. 4-1 usually give more up top. But the variations in performance from design and manufacture quality are much, much greater than the 4-2-1 vs 4-1 issues.

The best advice is to go for one with a known MX5 pedigree.

[sliq]

... or you can combine the two for the best of both.

The need for stainless increases towards the back where things are not as hot and there's more risk of moisture condensing there and rusting it out from the inside. So a stainless muffler and tailpipe are good.

Rust is rarely an issue up front, so that's a good area to use mild steel for low cost and better, deeper sopund.

4-2-1 headers usually gives a wider spread of power. 4-1 usually give more up top. But the variations in performance from design and manufacture quality are much, much greater than the 4-2-1 vs 4-1 issues.

The best advice is to go for one with a known MX5 pedigree.

on that note, i'd stick with racing beat or similar brands when it comes down to headers.. for the power increase, imo the $$$ spent on headers aint worth the power gain..

[manga_blue]

... or you can combine the two for the best of both.

The need for stainless increases towards the back where things are not as hot and there's more risk of moisture condensing there and rusting it out from the inside. So a stainless muffler and tailpipe are good.

Rust is rarely an issue up front, so that's a good area to use mild steel for low cost and better, deeper sopund.

4-2-1 headers usually gives a wider spread of power. 4-1 usually give more up top. But the variations in performance from design and manufacture quality are much, much greater than the 4-2-1 vs 4-1 issues.

The best advice is to go for one with a known MX5 pedigree.

on that note, i'd stick with racing beat or similar brands when it comes down to headers.. for the power increase, imo the $$$ spent on headers aint worth the power gain..

More like ... the power gain depends on the quality and matching of intakes, headers and exhausts as a set.

[Steampunk]

Rust is rarely an issue up front, so that's a good area to use mild steel for low cost and better, deeper sopund.

This is what I read from respected/reliable/expert sources; unless you want to go for the fooly sick bling, then mild steel is better for exhaust manifold/headers than stainless due to the thermal expansion characteristics of the two types of steel. Mild steel expands and contracts less than stainless and therefore is less susceptible to stress and breakage.