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If your wanting proper ITB's then you want Jenvey which come in different diameters and tapers so your chosen trumpets will need to maych them. Jenvey could advise best on the diameter best suited to your setup but almost certainly the 120mm length (the longest that will fit on a clio without a jole in the bonnet) trumpet will be best for the torque.
Got a set of schrick cams,gettin head gasfloewd with uprated valves and springs and arp lower bolts.engi e pretty much standard.just gettin it freshened up.