I'm not sure how to explain it in written word's but I'll give it a go, the OE design TIP has a more gradual reduction insize from the MAF to the Turbo, so in my mind the airflow would be smoother, the 3" one I can see haveing a bottle neck effect to the airflow, I'm not douting Bill design it's just I'm not convinced yet !!!
I'm out Saturday morning and then I'll be at AmD hopefully by about 1ish
Yeah I know what you mean mate and I thought similar things also don't worry. Personally if my car was at your stage where you have done all the stage 2 mods and fully mapped now I wouldn't have gone for it. Would seem like a very expensive mod however bare in mind my car is not mapped yet so I am going straight to stage 2 so worth the try in my opinion.
I will drop you a message over the weekend mate, be good to have a catch up also