quite a few of us here got done lol.. when igot done i had microtech ltx12s 550c inj ,3 1/2 turbo back exaust. ext w/gate. high mount gt35r turbo etc. put it all back to stock. the guy at mcleods sits ur car on the spot revvs it up and down and while doin this plugs in his own type of data logger into a lume in ur car which is located underneath the dash under the steering column which gives out readings so they can tell if its facory they go by factory specs give or take 5 % up or down etc. but theyre not all that bad just doing there job...