Before they were I-Speed, they were doing random car stuff outta Bill's garage and for the price of beer and food. They hooked up my slotted rotors and they are a fun bunch to chat with too!!!
I can't recommend them enough.
Check out the Bay Area forum on "the other site" and I can tell you now that Andrew, ac_gohan, KillerTHC, RimRockaz all have dealt with i-speed for turboing/conversion stuff and all their respective cars are VERY nice.