Didnt know if any company out there made a flange adapter from a t4 mani bolting to a S4 hotside. Probably take it locally to machine shop get somthing fabbed but want to get info before I start cutting up a nice tubular mani.

 

so you want to put an s5 turbo on a aftermarket t4 manifold? sorry Im confused but wish to help =)

 

http://www.raceonly.com.au/product_i...products_id=61

I found these manifolds I think it is what you want but I don't know if it will fit your car looks like they are for r100-s3 rx7's

 

I have a Rotary shack 60-1 hybrid which incorporates a s4 hotside on it which will perfectly mate to my RB REV2 exhaust. Tired of playing with internally ported wastegates because the boost never can be set and held hence the SS tubular mani which allows me to run my 40mm hks wastegate. Going braided oil/coolant lines so the last bit is to make mani and turbo to match up. SO flange adapter or possibly whole different t4 hotside but then I need to rebalance the turbo and finding a way to still run the rev 2. TO many times of me buying then having to change something to make it work.