3" Custom Downpipe - what did you buy, advice and critique required!

[silverzx]

Want to get the 205 moving along, need to make a downpipe for the GT2052V, what have people used?

Stainless or ordinary steel?

Obviously it'll be 3" 90 degree so heres a few I've found on eBay from a quick search:

Bend 1:
http://www.ebay.co.uk/itm/180726818044


Bend 2:
http://www.ebay.co.uk/itm/111084566646


Search results:
http://www.ebay.co.uk/sch/i.html?_from=R...22&_sop=15

It'll then need some flexi pipe right so have people gone for 3" again straight after the bend then reduced down to 2.5" straight after the flexi?

is this flexi long enough or will I likely need a longer one with more "flex"?

3" Flexi x4":
http://www.ebay.co.uk/itm/121118351209


3" Flexi x6":
http://www.ebay.co.uk/itm/181240997947


Then I'll need some straight pipe and various bends but I can just get that fabricated at a garage or buy the appropriate bends off eBay / whatever once I have the downpipe all sorted.

[padge]

im running a 3" downpipe, but my turbo is relocated so kinda have more room, ill be ordering one of those flexys today, as im going full 3" system, probs get the 4" one lol.

[Ricky]

I think I went 3" mandrel bend, cut as short as possible so it didn't hit the gear linkages, then a reducer to a 2.5" short flexi, to another cone reducer to 2.25" to attach to the leftover standard downpipe.

[silverzx]

im running a 3" downpipe, but my turbo is relocated so kinda have more room, ill be ordering one of those flexys today, as im going full 3" system, probs get the 4" one lol.

Mmm, not helpful!

I think I went 3" mandrel bend, cut as short as possible so it didn't hit the gear linkages, then a reducer to a 2.5" short flexi, to another cone reducer to 2.25" to attach to the leftover standard downpipe.

You went from the 3" bend straight to a short reducer then to flexi?

Surely your better off having 3" for a slightly longer period or does it literally just matter for that inital 90* bend to help with the initial flow?

[zx_volcane]

2.5 will be fine

Running 2.5 turbo back on the gt22v which has been good for 200+

3 inch is just more likely to foul things

[Ricky]

I was worried about space tbh.

[silverzx]

2.5 will be fine

Running 2.5 turbo back on the gt22v which has been good for 200+

3 inch is just more likely to foul things

You have a 2.5" bend off the turbo? I always thought 3" was the ideal size, but it's just from reading with no actual evidence..!

I was worried about space tbh.

It's going on my 205 so I should be worried about space too!

[padge]

my 3" downpipe clears linkages

[Ricky]

I thought the 205 actually had more space behind the engine?

[306Puggy]

FFS I've already make a thread about this! I am going for a 3" elbow into a reducer to 2.25 inches, it should be sufficient, it's not worth scrapping the rest of your 2.25 inch system for any performance gain you might have from a 2.5 inch system.

[silverzx]

FFS I've already make a thread about this! I am going for a 3" elbow into a reducer to 2.25 inches, it should be sufficient, it's not worth scrapping the rest of your 2.25 inch system for any performance gain you might have from a 2.5 inch system.

Fairly certain the 205's exhaust goes as small as 1.75"-2" at points..

[padge]

standard xud pipe is 2" im sure?

[silverzx]

standard xud pipe is 2" im sure?

I'm fairly certain its a 1.8D exhaust but then it wouldn't fit so might be a 1.8DT exhaust..

[306Puggy]

I hope it's 2.25.

[Tom]

I need to do something with my exhaust :/

---

This is what i used for my 2.5" downpipe! http://www.ebay.co.uk/itm/Jetex-Universa...43a9fb9ad3

[silverzx]

I need to do something with my exhaust :/

---

This is what i used for my 2.5" downpipe! http://www.ebay.co.uk/itm/Jetex-Universa...43a9fb9ad3

Did you then weld a bit of straight pipe then flexi after that 90!?

[Piggy]

that tight bend is exactly what you need...
then a little bit of straight, then a 4" flexi.
then a 60degree bend I believe...or maybe its 45...have to check then I would drop to 2.5" as it makes the rest much cheaper

[Paul_13]

There is more room in a 205 bay!

you're right about the exhaust mate. Mines 2" and narrows right down before each box

[Diggers]

3" downpipe
you can see how close it is the the linkages.

[Dum-Dum]

Mine isnt welded or fitted yet but it'll be a 3" v-band clamp into this

[Tom]

I need to do something with my exhaust :/

---

This is what i used for my 2.5" downpipe! http://www.ebay.co.uk/itm/Jetex-Universa...43a9fb9ad3

Did you then weld a bit of straight pipe then flexi after that 90!?

Yeah i welded a reducer onto that because i had a 2.25" system at the time! I THINK you might be able to get away with welding whatever angle you need at the bottom straight onto the flexi as long as it had some material each end of the bend if that make sense? So a bend like this: http://www.ebay.co.uk/itm/63mm-2-5-OD-45...27c8bebb0d

As opposed to a short on like this: http://www.ebay.co.uk/itm/63mm-2-5-OD-45...27be7a54d2

[darrenjlobb]

im running a 3" downpipe, but my turbo is relocated so kinda have more room, ill be ordering one of those flexys today, as im going full 3" system, probs get the 4" one lol.

Probs less room for downpipe with relocated turbo if im honest...And how is this relivant?

Other advice would be as said, use a mandrel short bent not long ones like in your links, as you will find they take up to much room / take you to far to one side out of the tunnel...And dont run the super short flexis, there so regid you may as well not bother, having a good flexi makes life SO much easier fitting exhaust etc, so well worth it.

[Tom]

I just found some cheap ass pipe too! Mill autos on trade, my local can get me 2meters of 2.5" for 8/9quid!

[padge]

kinda relevant as I said id be using a 4" flexy, as he asked which one would be best, just some input.

[silverzx]

Going to get these:

3" 90 bend:
http://www.ebay.co.uk/itm/290614647507

3" x 8" flexi:
http://www.ebay.co.uk/itm/251207174096

Now I just need to know if its a 45 or 60 degree 3" bend I need before I go into a 3" > 2.5" reducer then 2.5" the rest of the way.

[Paul_13]

That bend looks a bit Yeeehaaaa

[silverzx]

That bend looks a bit Yeeehaaaa

Yeah, it's a bit small/tight/pikey but it seems to be the one to go for!!

[darrenjlobb]

I just found some cheap ass pipe too! Mill autos on trade, my local can get me 2meters of 2.5" for 8/9quid!

Really?

Do they keep it in stock in town?

[silverzx]

I just found some cheap ass pipe too! Mill autos on trade, my local can get me 2meters of 2.5" for 8/9quid!

Really?

Do they keep it in stock in town?

I'm definately popping to Mills when I get a chance to sneak away at work!

[zx_volcane]

I just found some cheap ass pipe too! Mill autos on trade, my local can get me 2meters of 2.5" for 8/9quid!

Really?

Do they keep it in stock in town?

I'm definately popping to Mills when I get a chance to sneak away at work!

That is cheap, assume not stainless but who cares at that price?