US Headers & Exhausts NA

Regie · Postby **Regie** » Thu Aug 28, 2014 12:57 pm

Id suggest spending the $35 to get your current headers fixed and leave them installed.

manga_blue · Postby **manga_blue** » Thu Aug 28, 2014 1:00 pm

Probably not a 4-1. Many here have tried 4-1s here and on miata.net in the past and have not been really happy with the results. Of those only the Racing Beat 4-1s have been reliable performers. In general 4-1s are probably best/only suited to race applications where they excel at delivering peak power at peak RPM but tend to be a patchy in low and mid ranges.

4-2-1s are a much better choice for road cars. Any half decent design and execution of a 4-2-1 can lift power and torque at least right through the mid RPM range and usually well into the peak range as well. Most track MX5s in Australia, except the ultra-modified ones, run on 4-2-1s. The extra grunt you get for pulling out of corners with 4-2-1s more than compensates for the minor advantages of 4-1s at the peak.

manga_blue · Postby **manga_blue** » Thu Aug 28, 2014 1:10 pm

Regie wrote:Id suggest spending the $35 to get your current headers fixed and leave them installed.

Regie's price is about right. I'm going to get the flex section on mine replaced again next week. It's a $25-35 recurring expense on a car that I push very hard on the track and has the odd argument with ripple strips, kitty litter, etc.

Our local muffler shop guy has a masters degree in Political Science. Price partly depends on how solid a contrary political argument I can sustain with him while he welds.

gslender · Postby **gslender** » Thu Aug 28, 2014 1:31 pm

Dupain wrote:The new CX 4/1 is an stupid design with the larger than usual dump pipe and unequal length primaries. I'll be in a position to make wild guesses on stock vs 4/2/1 vs 4/1.

Fixed that for ya

manga_blue · Postby **manga_blue** » Thu Aug 28, 2014 1:46 pm

I doubt that would help. 4-1s seem to be very difficult to get right. Racing Beat has succeeded with a lot of testing and high standards of manufacture. From the photos you've posted of the CX ones the standard of manufacture looks like absolute shite and the whole design seems to be a cheap conversion from headers made for an east-west or right-side exhaust engined car. Hence the very bizarre inequalities of lengths in the primaries. Their main selling point seems to be an emphasis on bling over function. Using a large dump pipe would exacerbate the difficulties in getting rid of peakiness in 4-1s. I just can't see how putting a strangler plate on an oversized dump pipe would do anything but make them worse.

As a general comment, if you're buying parts to be installed by others then you need better made, more precisely dimensioned components than you'd put in yourself. Otherwise you burn all your savings and much more on paying the mechanic to bend/grind/weld/cobble things up to make them fit.

speed · Postby **speed** » Thu Aug 28, 2014 2:14 pm

Manga has answered for me. RB for 4-1.
Did you consider cutting a hole in you bonnet and just have 4 single straight pipes . Would look sic with 4 strangle plates and be sure to give you more noise.

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sailaholic · Postby **sailaholic** » Thu Aug 28, 2014 2:50 pm

CES I believe make the exhausts for Garry Stewart race motors in QLD. Having said that your talking about the same price as the maxim works ones with VERY long primaries (compared to most off the shelf versions) and they are fitted to motors that see 1 or maybe 2 seasons before a rebuild.

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Mr nanotech · Postby **Mr nanotech** » Thu Aug 28, 2014 4:23 pm

Oh my god... I don't even know what to say to this thread.

Get yourself a standalone computer and a wideband, some mild cams and be done with. I can't believe I just read you claim your catback system makes your car 'pull like a train'.

Better yet, sell your car and buy a playstation.

speed · Postby **speed** » Thu Aug 28, 2014 5:08 pm

Better yet, sell your car and buy a knock off playstation

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project.r.racing · Postby **project.r.racing** » Thu Aug 28, 2014 5:54 pm

It took 2 days to install headers?

MattR · Postby **MattR** » Thu Aug 28, 2014 5:57 pm

Going by the pictures I could believe that, they didn't look the best quality.

I wonder if Dupain will be welcomed back to the shop, sometimes no amount of money is worth the pain....

Odd · Postby **Odd** » Thu Aug 28, 2014 6:22 pm

My bet is at 4000rpm they play the Chinese National Anthem.... :lol:

speed · Postby **speed** » Thu Aug 28, 2014 6:42 pm

Dupain wrote:Doing a test run tonight on the Old Pacific Hwy @ 7.30pm.

Where abouts? I'm picking up the r32 tonight. Want to hear what a good exhaust sounds like and I'll happily show you ;)

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project.r.racing · Postby **project.r.racing** » Thu Aug 28, 2014 6:45 pm

speed wrote:
Dupain wrote:Doing a test run tonight on the Old Pacific Hwy @ 7.30pm.

Where abouts? I'm picking up the r32 tonight. Want to hear what a good exhaust sounds like and I'll happily show you ;)

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i'd be going the other direction. those awesome quality blembo brakes are fitted to his car.

speed · Postby **speed** » Thu Aug 28, 2014 7:06 pm

project.r.racing wrote:
speed wrote:
Dupain wrote:Doing a test run tonight on the Old Pacific Hwy @ 7.30pm.

Where abouts? I'm picking up the r32 tonight. Want to hear what a good exhaust sounds like and I'll happily show you ;)

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i'd be going the other direction. those awesome quality blembo brakes are fitted to his car.

He'd have to get in front of me first ;)

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