if you're not running A/C, then you can use 2 A/C fans. Just splice the radiator fan plug to run both of them at the same time. that's if you're on a really tight budget. even if you use an aftermarket unit, i would run a manual override. I've seen a few reliablity problem aftermarket fans in turbo engine. they're just not as reliable as stock. With a manual override, you can simply flip a switch and the fans come on and stay on until you turn them off. Just a little help in a bad situation, such as overheating at track days.