I have a 01.5 tip S4 and I am looking into chips right now. I have seen many i.e. Revo, GIAC, APR.... But today I came upon a type of chip that I am not sure of. The numbers look better than the 70hp promised with the GIAC-X ( which I was going to go with). I know a lot of tuners do their own chips. Is there anything I should watch out for with these other type of chips???

http://www.tjmmotorsport.com/store/p...e=12&engine=51