all gaskets were in the box its a pretty thick one i don have it in front of me but id have to guess its pushin half inch mine is in a waggon but everthing should be the same in a sx4 i remmeber reading somthing somplace about clearance issues with a manual trans but it was a real simple fix. its real tight i mean REAL tight down by the motor mounts and front drive shaft. the collector pops out about a inch or 2 below the drive shaft. and i had to do some file work on the intake. i had some clearance issues around the back dowel again real simple fix. one of the upper intake bolts didnt fit quite right so i had to file the notch out to make the bolt go in straight and the little circle on the intake that fits on the dowel hit the header flange so i nipped it off flush and torqued everything to 35 ft lbs (i think thats spec and way)