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Old 10-07-2008, 04:15 AM   #1
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so... im looking for a template of some sort or perhaps a list of bends used to make a downpipe for a miata... anyone has anything? i bet it will make a great sticky thread if someone actually has something
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Old 10-07-2008, 05:01 AM   #2
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well the begi-s looks like a 90* coming out of turbine followed by a 45*. Then to clear the transmission flange while not hitting the firewall, it looks like theres an s-bend made of two 45*s and then straight back including the flex bellow to the cat.

Only thing i think i want around for the build is a miter saw with a cuttoff wheel so i can get straight cuts when i finetune the fittment. Something to expand the pipes a bit would be super sweet too. Then tack it up and have a shop weld it up.
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Old 10-07-2008, 05:15 AM   #3
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i cant weld for **** so ill just duct tape it and will have shop weld it for me

so... what bends should i get? 1x 90* and 3x 45* + 10' of straight? i think im gonna grab a U pipe as well while im at it in case i need some weird angle or something... this will be fun and will involve a LOT of duct tape...
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Old 10-07-2008, 06:02 AM   #4
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I was planning on doing something like this. I have the top part of an old FM pipe that gives me a short 90degree bend from the turbo, to clear the firewall. Ill be using these connectors http://store.summitracing.com/partde...5&autoview=sku To adjust the size from 2.25 > 2.5 > 3". Right now im still not sure if im gonna go with either a cutout or a complete exhaust. http://store.summitracing.com/partde...5&autoview=sku Was thinking this thing which will do the 2.5">3.0">2.5 to stock cat. Also thinking of an electrical cutout for a fraction of the cost of a true 3".
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Old 10-07-2008, 12:20 PM   #5
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Old 10-07-2008, 01:03 PM   #6
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What sizes are you dealing with? Will it get progressivley larger? It its all the same size you could probably just use one 180 bend and a section of straight.

Masking tape works well. It cuts clean with a razor for tacking and it doesn't leave the nasty residue behind.
--Alex
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Old 10-07-2008, 02:59 PM   #7
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I bought a tight radius 90 bend, regular 80 bend, and 6 feet of straight for mine. The 90 coming off the turbine, the 80 off that going back to the straight.
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Old 10-07-2008, 03:41 PM   #8
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pics?
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Old 10-10-2008, 03:23 AM   #9
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when i make mine ill document it for you guys. Or ill get lazy and pay the $300 for the begi-s downpipe with modification for a standard 5 bolt t3 flange.
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Old 10-10-2008, 03:48 AM   #10
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eh... wont need this anymore... a client of mine will be building my miata engine and finishing my turbo

going 3" all the way with catalytic and resonator
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Old 10-10-2008, 03:55 AM   #11
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Quote:
Originally Posted by akaryrye View Post
when i make mine ill document it for you guys. Or ill get lazy and pay the $300 for the begi-s downpipe with modification for a standard 5 bolt t3 flange.
Looking forward to seeing this. I have future plans for this as well.
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Old 10-10-2008, 04:58 AM   #12
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Quote:
Originally Posted by UrbanSoot View Post
eh... wont need this anymore... a client of mine will be building my miata engine and finishing my turbo

going 3" all the way with catalytic and resonator
How much work have you actually done yourself on your car(s)??
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Old 10-10-2008, 05:43 AM   #13
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I'm betting on 1 90 degree, along with 2 45 degree bends..


but just in case, I bought an assortment of 10 misc bends in 3" mandrel aluminized. Once I get a good one fabbed up I might make it out of stainless, if I can get access to a TIG welder and figure out how to use one again... Don't think its quite like riding a bicycle...
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Old 10-10-2008, 06:36 AM   #14
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Quote:
Originally Posted by zoom2zoom View Post
How much work have you actually done yourself on your car(s)??
almost all of it besides lifting/installing heavy stuff (im very skinny) but id rather have someone else do it because i dont have time...
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