if you are looking for performance, both of the trannies suck ass... the hf tops out around 200mph ... if you have it bolted to a stock d series you will never get out of 3rd gear unless you just want to save gas... you can hit 80-90 mph in second gear with those... i would recommend an si or dx or the hf with a si final drive.... you can pick up these all day for under 100....