Are there any performance gains for the secondary see decat x pipe over the straight pipe decat?
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While it does not answer your question, I did the secondary cat replacement straight pipe and see little performance difference but great sound improvement.

 

Thanks, I've read other people say the same thing. I suspect that the x-pipe also doesn't add any significant power either, but wanted to check.

 

X-pipe alone red color on diagram. (Vantage V8)
Much better with VAP Velocity tune !! Green color

 

The service manager talked me out of the decat on my Rapide. He said it would be "too much" for the kind of car the Rapide is. I had the decat on the Evora and Vantage. I trust his opinion and never pursued it.

 

Thanks. I've got the VAP cats and X-pipe on my Vantage. The VAP cats alone made my Vantage a lot louder, but the x-pipe made it quite a bit quieter.

VAP has dyno results for the x-pipe on the Vantage, but nothing on the DB9. I've seen dynos for the straight decat on the DB9 that showed marginal gains, but wasn't sure if the x-pipe would be better (and if so, how much).