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From the pictures, it looks like you will have to extend the wires for the rear 02s. Don’t know about the fronts. But that is no big deal. For the bigger 3.0” midpipe, it looks like they staggered the clamps for more room, but that may mean the rear pipes are staggered and if so, or if they are still 3.0”, they might not mate to a stock or aftermarket rear exhaust, in which case, you could buy the Becker version. Again, I don’t know for sure from the pictures.
I like the more forward placement of the X in the midpipe. That is supposed to be a better location than further back but the difference between 2’ and 4’ from the header collectors may not matter much.
Looking forward to the dyno. Thus far, it seems like bigger exhausts don’t add power except maybe on forced induction or stroker motor cars. More testing like you are doing will be helpful in figuring that out. Could be that you will need a custom tune to take advantage of less exhaust backpressure.
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