Cutting the shelf behind downpipe

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06-07-2010, 01:14 PM

#21

falcon

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Quote:

Originally Posted by wayne_curr

I really think you should go with a bottom mount setup. You're still going to have a hard time getting a 3" downpipe in there with that removed.

I can seam weld it if you need me to. I could probably tote my welder up there without too much issue except I dont know how they feel about bringing pressurized gasses across the border.

No reason to sell what I already have. Even if I keep the current DP, I'll be happy. I just want to be able to put the downpipe on after the turbine housing gets bolted on.

Are you up for making me an exhaust though? From my "cat" back... I want to re-locate the magnaflow I have on the back to right after the downpipe and run a left exit "straight pipe".

06-07-2010, 01:22 PM

#22

wayne_curr

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Always down to do exhaust work. This left-exit exhaust trend is really interesting.

06-07-2010, 01:28 PM

#23

falcon

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I'm cutting my bumper, and want to get rid of as much weight as possible. And the exhaust I have droops too low and always scrapes (and I'm not even that low!). There is ample room to re-do the exhaust a good 2-3 inches higher. And it will involve very few bends = more flow.

06-07-2010, 01:54 PM

#24

m2cupcar

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I did it for a smooth top-mount 3" dp. But wouldn't do it w/o welding some plate in.

06-07-2010, 02:05 PM

#25

chpmnsws6

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Quote:

Originally Posted by rugger

Don't cut into it anymore than you have. There is structure behind there, and you don't want to mess with it. However, the "ears" against the firewall can be cut out entirely. Every v8 miata has them cut out. Picture of mine before paint:

edit: There are some subframe mods that can be done as well that will give you crazy room. Let me know if you want to consider that.

You left a lot of meat on that! Mine is cut flush with the "frame rail" on both sides. We added in 1/8th inch steel plates to both sides for some added bracing, and was going to triangulate the corners some, but ended up getting lazy

06-07-2010, 02:24 PM

#26

wayne_curr

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Quote:

Originally Posted by falcon

Remember me telling you I was afraid of that? I can redo the hangers on that so that it will never scrape (depending on how low you are) or bang around when you go around corners at the track.