a cosy turbo will bolt onto your manifold as long as its a escort manifold for a t3

they are virtually the same turbo bar the ex housing where you would need to modify a cosy down pipe to your exhaust

these are less restrictive that a erst hosuing an a lot of people use them

or if you want to use your erst housing the cosy t3 will bolt straight in

just take the ex housing off the cosy turbo and put it into the erst housing

i done this on my turbo