here is my response to my client...
1 BOV : Tuning doesnt mean SHIT for a BOV NOT A DAM FUCKING THING. You do NOT shift when you tune. If he is, then hes a fucking idiot and you shouldnt take your car there. Bov's are a MUST when exceeding 20 psi. HE was the one that PROVED that the stock one fails @ 20 psi. Your choice in BOV was made before I even got to your car. BUT it WILL NOT be a problem when tuning. The only time a Bov can effect your performance is in a road race or auto x when you are having to shift. And in that case YOU SHOULD STILL DITCH YOUR STOCK BOV. The two best choices for the least drop in power for the 1 second in between shifts would be either worx or aps.
CAI : we have fucking proven 10 hp to the ground with the injen, UNTUNED. it simply raises the flow capacity of the stock airbox. gives the same pressure readings just flows more. which is exactly how the worx tuning cai is made. dyno time should be increase by anymore than 2 seconds because of this mod. if it is then your tuners a fuggin idiot. Side note. HE sold me an aps intake, the first one that was so large it did NOT keep the factory pressure readings and DID need a retune just to install it, it took him 10 minutes to compensate for a BIG MAF desgined CAI.
Perrin hose: The look alike is used on the s203 for a reason. subaru is NOT stupid despite what people think. That hose IS a choke point, which I have proven to NUMEROUS people. If you want to strangle your turbo go ahead and live without it. Sidenote : Christian himself suggested I buy the samco version long ago cause it was the only one made and HE was the one that SHOWED me the choke point. Since then the perrin has been the choice, due to better design.
Ground Kit: Please see my post on seccs.org
http://www.seccs.org/forums/showthread.php?t=3358
Catback : Any IDIOT that tells you a catback makes big power is out to fuck you. That being said the number one choice for catbacks would be whichever one sounds better to you. So your choice in catbacks is fine.
We need to discuss what you do from here in person, please contact me after my bday weekend.
Phil