The Sirio pipe as you well said is suitable for 3 port EFRA tuned engines. That pipe was used by the official drivers for Kyosho / Sirio at the worlds.
Since you have a 5 port outlaw engine, you need an outlaw pipe with bigger stinger outlet diameter (6mm). Try the RD Logics Turbo II outlaw pipe.
The Collari engines are sold in the USA by
www.werksracing.com
and they sell a pipe for them, which is similar to the M.Mielke pipe from Yokomo.
AFM