I have an 80 Jimmy, A/C and smog crap. I'm thinking of getting headers and either keeping or redoing the dual glasspack setup to flowmaster 50's. I'm thinking of getting this from Summit Racing : WLK-85003 Dynomax headers are computer bent and leak tested, have die-cut exhaust port flanges, and machine formed and hand welded primary tube ends for unrestricted exhaust flow. They come with a black painted finish. WLK-88304 Dynomax designed this bracket specifically for Chevrolet small block applications with factory-installed air conditioning compressors that bolt to the exhaust manifold. This bracket takes the place of the factory piece when using headers. Would I have any problems with these and will they sound better/ increase power? Thanks.