you will hear brenspeed and also bamachips. both are great to deal with. i personally used brenspeed and his service is second to none. but looking back i wish that i went to my local tuner, pro-dyno. i am not saying that brenspeed didnt do a great job, but i noticed that with the custom dyno tune my car made more power above 4000. now the only problem that i run into is when i add parts, brenspeed with give you a free tune when you buy their parts, while most dyno shops will charge you for another tune. if i were to do it again, i would have stockpiled all of my parts and installed then at once with one trip to the dyno. but if you want a quick car now get the cai (jlt or c&L) and the tune from brenspeed. if you read through the site you will see tons of arguments over what tuner or cai to go with, but that is my .02
ken