i havnt seen an "i.s" or m42 / 44 intake, so i guess it would need to be a m50 / 52 custom.
we have Simotas for sale at our shop
http://www.schmiedmann.com/index2.htm under Carbon intake system
Abrahams Motorsports sells for us in the US
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I would do the Internal work first ( cams , porting the head) and then map the car.
Otherwise the map u get made won´t be correct for the engine after the cams are put in