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I don't understand how you can mention the words "goals and budget" then list the two most expensive CAT-BACKs on the market that do nothing for you except cost a ton and save about 8lbs (negligible for you). You can buy full turboback exhausts for LESS than the cost of those cat-backs, so if you have a budget, then I have no idea why you'd want those. In fact, you could probably get a TBE, MBC, BOV, fuel pump, and a tune for the money you plan to spend but you'd have 70whp over stock instead of 25.
There is no real difference between those two - either can be mated to whatever test pipe and downpipe you want.
The Megan isn't great, but it does not "crack or cause leaks." I am not sure where you heard that about an EXHAUST. That is only a problem with the exhaust MANIFOLD - a completely separate part on the other side of the turbo. $900 for the AMS isn't more than you'll spend for a titanium cat-back, and tuning costs will be the same either way.
The dents on your DP don't affect performance much, but the stock DP itself is a restriction compared to aftermarket.
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11.51@117.72 - PMI
11.62@116.60 - Bandi
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