looking for input on my custom exhaust.....

[futeki_supra]

well I plan to build a custom exhaust for my 87 turbo,

my goal is to have something that looks similar to the greddy DD exhaust.

for referance

I plan to later order a aftermarket down pipe but for now, I ( and my friend who can weld/owns a mig ) plan to go with a 2.5" or 3" pipe from right before the first converter down to the end of the second one w/ a straight pipe (test pipe, I guess ), and then have that connect to a magnaflow 3" 1 in 2 out muffler like this

and then go to my local muffler shop and buy 3-4 feet of 3" piping,

and I am going to order ( or if possible buy localy )

1 or 2 of these from ebay

and then buy 2 of something like these.

( those are 12" long, I might want longer ones..?.. )


and then I will need some ( say 5 to be safe ) hangers from local muffler shop.
and I will also buy some new rubber hangers

and I would like to keep this around the 200$ range, and hopefully have it look and sound as good as I want it to.


so my questions are these,


1:
I have never used a muffler like what I plan ( always fart cans, lol )
I have no idea what brand or style of muffler will suit me best

does anyone have any experiance with these styles?
I would like the exhaust to be a bit on the louder side, but nothing too crazy
( I am a former rotary guy, and on all 5 of my 7's have had straight open exhaust = louder than hell

so I am not sure what kinds of mufflers would be best.....

2:
how much 3" piping should I get ( from the test pipe, back )
I about a 1 foot from the test pipe to the muffler
( also I dunno where this muffler would fit best under the car )

and then from the muffler out I will need double the piping,
I am just guessing at 2 feet,

and then from there I will have the 2 tips exiting the back ,
( yes at a mega sicc jdm angLZ :icon_bigg )

3:
how many of those mandrel bends should I buy?

I would think ( again I have no idea, just guessing )
2 should do it b/c I plan to try and keep this exhaust as straight flowing as possible.


---

and I would like to have the two pipes from the muffler to be identical and maybe in 1 or 2 spots have a flat peice of metal ( or a peice of hanger )
welded in between the pipes to hold them together,

the other thought I have, is to not use any chrom tips at the end, and just have the 2, 3" pipes exit the back
( now that I picture it that might look alot better, lol )

and maybe going over the whole exhaust with a high heat flat black spray paint.

I am thinking this shouldn't be too tough to do, and IMHO would look pretty bad ass,

I appriciate ALL/ any kind of info or tips you guys could offer,

this is my first supra ( and I have only driven it 3 times, on the 3rd time I blew the Head gasket, lol, the car is at my friends shop getting fixed, and I hope to have it back by the end of december , lol, I didn't plan to drive it on the shitty nebraska snow/salt roads anyways ,)

but eventualy my goal with the car is around 280-300 rwhp, and I have also been going over the Idea of getting a cut out just before the muffler and routing it with a peice of pipe to after the muffle, to pretty much just by-pass it, anyways I think this exhaust should be sufficient.



well, sorry for being soo long winded and rambling, and again any help/tips is appriciated,


and just for fun this is what the DD looks like on a car

looks pretty much badfkn ass IMHO
( my second fav. is the buddy club spec II, essentialy the same idea with 1 exit instead of 2 )



ok I'm done LOL

 

[s383mmber1]

O wow! This jsut gave me some great ideas!

Are you going cat-back, or downpipe back?

 

[Mr.PFloyd]

i dont see why you woudl need the 180 degree, i think 2 45 degree bends would suffice.
-Thomas
edit. Will, i htink he said catback for now.

 

[BorHor]

There is an exhaust thread on SF where someone posted a set up where it split in to 2 2.5 in pipes i think..

 

[jdub]

i dont see why you woudl need the 180 degree, i think 2 45 degree bends would suffice.
-Thomas
edit. Will, i htink he said catback for now.

If you buy a 180 and cut it, you can customize to exacty what bend you need. And you'll have a bend left over to use further down.

 

[Mr.PFloyd]

If you buy a 180 and cut it, you can customize to exacty what bend you need. And you'll have a bend left over to use further down.

meh, i guess :icon_razz
perhaps i too should invest in one of these 180 degree bends hmm.

 

[Rajunz]

That should look really cool, I like that SC.

 

[Mr.PFloyd]

That should look really cool, I like that SC.

no ninja edit out of this one :icon_razz

 

[jdub]

IMO - Use the chrome tips...it will look more finished and the heat will color the chrome a bit. Or use stainless for the tips, polish and get that gold color from the heat

If you're using mild steel for the piping, get the whole thing ceramic coated on the inside/outside. That makes it bullet proof and you will never have a worry about rust. The down pipe should be a 2000 deg ceramic, the CAT back can be the lower range stuff (doesn't get that hot) to save some $$$.

 

[supra90turbo]

I was gonna say, buy 6' of Inconel and make that be the last 3' of each pipe... mmmm

www.burnsstainless.com is yo friend.

You can get thinwall Stainless there too.
This is exactly the thread I was hoping to see as I'm going to make something similar for my car. I shall be following this intently.

 

[supra90turbo]

just for fun...

3.5"IDx17 1/8" long SM-350-450-17 $230.27

3.5" primary using the MC2-350 basic idea, $331.00

3.5" 16awg 304ss straight ST-350-16-304 $21.41/ft

3.5" 16awg 304ss u-bend: UB-350-45-16-304 $101.34

They only list Inconel up to 2 1/8" on the site, but they must have larger than that...

then, finish it off with some slip-fit tabs and springs
Springs: $3.50/ea
Wire tabs: $1.50/ea

 

[Mr.PFloyd]

yo ho had that pic of the underside of the car? i cant fidn mine on my hard disk.