I like the seio's I have 2 620's in my 77 with 2 mj 1200's... and for the extra $15 bucks the flow is way better... more of a cone shaped flow instead of a jet. I did have a problem getting one to start after I turned it off... just plugged/unplugged a couple of times and it started again... next time I'll take it it back (always save your boxes kids
a good seio= better deal
JME