i want to buy a welder to fabricate my own exhaust system. i would like to be able to join pipes nicely without gaps in the pipe joins. i would also like to fabricate my own manifolds. what welder or welders should i buy? also what do i need to cut out the plate that bolts to the engine? the part of the manifold with ports and stud holes on it (flat plate) thanks everyoneThanks in advance