o2 housing question

[Funfettie]

Hi there,
So I just upgraded exhaust to a magnaflow 3", and I was wondering is anyone makes a 3" recirculating 02 housing. Im finding all sorts of 2.5", but no 3". Does a 2.5" restrict flow on high power systems? Im shooting for 550-600whp with an internally gates PTE5857, any thoughts?
Thanks
Bob

 

[91stocker]

Does that have the 3" v band housing?

 

[Funfettie]

Nope, it has the standard 4 bolt surface(not sure if it has a special name) that bolts up to the stock o2 housing.

 

[91stocker]

A quick search came up with

DSM 3" o2 Housing Eliminator - 1G DSM o2 Housings - 1G 90-94 - Exhaust - DSM Performance Parts | DSMparts.com

I think shearer (hope thats spelled right) also has some 3"

Edit: Well their site is down, not sure whats up with that.
http://www.shearerfab.com/

 

[CanadianTalonTC]

FWIW while the exhaust gasses are still very hot (right after the turbo) they flow better than when they start to cool, so I could imagine you'd get away with 2.5" there.

Also I've read you can port the Evo III 02 to three inches.

Joel

 

[Funfettie]

Awesome, thanks guys! Very useful answers!