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I can't speak for the exhaust/header gains as it seems like a small HP gains for the $$ invested (not cheap) but for little wrenching and small investment of couple hundred bucks you can do the 987 airbox, 996 TB, and 997 T as a single mod and I think you would be quite surprised. Power gains throughout the rpm range and wider smiles at least for me. Butt Dyno says to me about 10 -15 just my opinion. It's a different car and no Cels. Passes smog no problem. Bang for buck 👍 Hardest part is 987 airbox
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