Wastegate to downpipe elbow

[gmac78]

Hi guys,

I'm needing to order the last part for making my 3" downpipe and exhaust. However i'm not sure what size the small elbow from the wastegate exit to downpipe is? Currently offshore so can't take any measurements.

The wastegate flange i have bought has a 46mm hole in it, not sure if that is the same size hole on the original downpipe or not?

Here is the link-

http://www.ebay.co.uk/itm/2012412930...%3AMEBIDX%3AIT

However 46mm equates to 1.8", just wondering is 1" 3/4 OD what i should be using or will this restrict the flow ever so slightly, should the pipe be larger than the 46mm hole in the wastegate flange?

Any input much appreciated.

[Kieron20V]

I use a 2" tight 90deg bend for mine trimmed to fit. Slightly bigger than hole in flange. Have a look in my thread.

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[gmac78]

Hi Kieron, ok cool thanks for that, 2" it is then. I haven't started to build the downpipe yet but looks like it's going to be fun, not much space round that plate that protects the CV boot. Any good tips for me?

[diesel des]

Get a 2 to 1.5 inch concentric reducer and cut it too suit.

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[gmac78]

Is 1.5" not smaller than the size on the standard downpipe? Would have thought slightly bigger would have been better?

[diesel des]

Cut the reducer at the size you need and use a 2 inch bend.

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[gmac78]

i'm with you now, early night needed tonight i think! Yeh thats a good idea alright, don't think i've seen anyone do that to be fair but good idea all the same. Hmmm....

[Kieron20V]

2" pipe with 1.5mm wall is 48mm inside, don't see point of a reducer.

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[diesel des]

2" pipe with 1.5mm wall is 48mm inside, don't see point of a reducer.

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True I suppose.

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[gmac78]

Slightly off topic. I'm going to fit a flexi in the exhaust system to try and preserve my RS2 exhaust manifold, however where do you guys reckon the best place would be to situate it? At the bottom off downpipe with "V" band, or on straight section of exhaust?