About to pull the trigger on exhaust/cobb AP. Flex or non-flex UP?
Hey guys, i'm just about ready to install my Perrin divorced downpipe, borla hush, cobb accessport and downpipe. I've been doing a lot of research on the benefits/disadvantages of having a flex UP. Obviously the flex pipes are easier to install and usually cost less. The disadvantage to a flex UP is that it has a tendency to leak more because it is made of relatively thin stainless steel which will contracts/expands more than cast iron and can cause this phenomenon. This being said, i'm leaning towards a cast iron UP such as the one made by turboXS. My only concern is the difficulty of installing the UP. I'm going to have a mechanic install the entire system who has a ton of experience with turbo cars (mainly Audis, Porsches and VW's). If he is comfortable with installing a cast iron UP should I go for it? Any other UP's you would suggest? I really want to install this once and forget about it. I don't want to monkey around with an inferior product and have to track down an exhaust leak at a later point.
Secondly, since I'm going to use the cobb AP immediately to flash to stage 2, should I even bother with a mechanical cel fix?