the bad is that u need to upgrade your condenser fan with a slim fan cuz the stock is too fat and you'll have clearance issues with the exhaust manifold, even worse with a header.. on the engine fan you'll barely clear the radiator hose or simply upgrade with a slim fan...
I think I would go with a push fans with how close those are to the header. Either that or would be a definate canidate for some Jet Hot coating. Probably worth it too.