Building My Own Exhaust

[Omurru]

I know this seems like a pretty simple question but I am after 3.5" stainless pipe with a sidewall less than 1.6mm, I have rung around a number of exhaust shops and they all seem to say 1.6mm is all they can get and all they use, and the steel suppliers I have rung don't carry pipe of that diameter to begin with. After something with a bit thinner wall to help save some weight and hopefully it will give me a bit of a raspier note as well similar to using titanium....

[kristafa]

you *might* find straight stainless in less than 1.6mm wall, but dont expect to find mandrel bends under 1.6.. i've only been able to get a hold of 1.6 and as you'd know you can get this from pretty much anywhere

[Omurru]

Yeh thats ok, no need for bends

[scotty nm35]

You could probably order in 0.9mm but from what I have found, anything not on the shelf costs twice as much. It would ding very easily if you hit a speed hump too. 1.6 is the go, unless you can afford Ti.

How do you plan to bend? Are you going to go the lobster?

I'm halfway through making a custom dump for a gt35 with 3.5 inch lobster bent pipe into twin 3 inch for a customer with a big power 2J.

[GUN_METAL_GTR32]

I know this seems like a pretty simple question but I am after 3.5" stainless pipe with a sidewall less than 1.6mm, I have rung around a number of exhaust shops and they all seem to say 1.6mm is all they can get and all they use, and the steel suppliers I have rung don't carry pipe of that diameter to begin with. After something with a bit thinner wall to help save some weight and hopefully it will give me a bit of a raspier note as well similar to using titanium....

hay buddy

dont mean to burst ur bubble but it wont sound anything like titanium ... not even remotely.

anyways

how long do u need this pipe i can find out for u on tuesday thru a mate of mine.

Edited June 13, 2010 by GUN_METAL_GTR32

[Craved]

onesteel trade book doesnt have SS 63.5mm tube in less than 1.6

[XRATED]

How keen are you?

http://www.burnsstainless.com/straighttubing-3.aspx

Cheers

J.

[scotty nm35]

Their 3 inch and up only seems to come in 20g.

Your other option is to get some 1mm sheet cut and rolled, giving you the option of oval tube for clearance. Personally I would just go for 1.6mm as anything thinner will crush too easily.

There would be a lot more weight in a muffler which could be saved by making an alloy body version.

[Cartman]

Their 3 inch and up only seems to come in 20g.

Your other option is to get some 1mm sheet cut and rolled, giving you the option of oval tube for clearance. Personally I would just go for 1.6mm as anything thinner will crush too easily.

There would be a lot more weight in a muffler which could be saved by making an alloy body version.

+1

[Omurru]

hay buddy

dont mean to burst ur bubble but it wont sound anything like titanium ... not even remotely.

Why not? I understand ti doesn't transfer heat as well as s/s but I would have thought the stable temp it sits at when driving wouldn't have been much different?

Their 3 inch and up only seems to come in 20g.

Your other option is to get some 1mm sheet cut and rolled, giving you the option of oval tube for clearance. Personally I would just go for 1.6mm as anything thinner will crush too easily.

There would be a lot more weight in a muffler which could be saved by making an alloy body version.

Yeh i've been having a crack at doing some rolling at work, isn't as easy as it looks, took a while to get to the point where I could roll lengths the same. I'm off work for 9 weeks now so won't be getting this done for a while.

On a side note does anyone know where I can get a 'Y' piece that goes from one 3.5" to 2x2.5"?

[scotty nm35]

I just cut them on the brobo.

[Rowdyr32]

Really impressive work. Does the brobo cut it that clean or do you have to clean it up a fair bit afterwards?

[scotty nm35]

Perfectly clean, with the 3.5 inch the vice starts to deform the pipe while holding it which can lead to a slight gap but otherwise no problem. You end up with a nice knife edge inside the Y pipe.

[scotty nm35]

Finished my new dump and front pipe today, I tried to make it as straight as the space would allow. The rest of the system is a second hand Legalis, Im hoping to quieten it down.

[bLaQ.bOi]

Perfectly clean, with the 3.5 inch the vice starts to deform the pipe while holding it which can lead to a slight gap but otherwise no problem. You end up with a nice knife edge inside the Y pipe.

got a lil trick for you... get some 3inch pipe... not tube pipe. whatever scheduele... just make sure the inside diameter is 3inch... only need maybe 100mm

then cut a slit ALLL the way through it. so not "around it"(like the brobo does) but down the side... and then cut 5mm of one side. i know im over complicating it lol. but what i mean is.. just cut 5mm of the circumference

then slide this over your 3inch tube. put it in the vice. tighten up.. and nothing gets deformed

ill pm this to you incase you dont go back on to this thread