cylinder 5 with the result that in all of the exemplary embodiments four catalytic converter elements 39 are provided the catalytic converter elements 39 which comprise for example a wrap around plate which is known per se are of cylindrical design and can be arranged standing or lying in the exhaust gas collector housing 9 the catalytic converter elements 39 are held by knitted wire fabric elements which are not illustrated as an alternative to this the use of a conventional catalytic converter in the exhaust pipe 8 is of course also possible as already mentioned above in fig3 the abovementioned fastening means which are designed as screws 18 and are intended for mounting the exhaust gas collector housing 9 on the cylinder head 2 are illustrated said fastening means are passed through the recesses 12 in the exhaust gas collector housing 9 and the recesses 14 in the sealing device 10 appropriate tightening of the screws 18 enables the displacability specified above of the exhaust gas collector housing 9 with respect to the cylinder head 2 to be set however in this case tightness of the exhaust manifold 1 is ensured at all times furthermore it can be seen that the bores 15 of the sealing device 10 are provided with beadings 19 which reach into the exhaust gas.