Here we go!

To the OP -- let's just say that the power gained by intake and exhaust mods is highly controversial, some mods more so than others (e.g., is there anyone out there that believes that a red silicone tube nets you 10hp?).

Re the plenum specifically, it's been beaten to death on this board -- do a search and you can uncover the history (and emotions) and make your own assessment. I think even the most ardent plenum supporters wouldn't say it gives you 30hp.

I decided to add it because I was doing a bunch of other mods at the same time, with the primary purpose of improving sound -- which I did very well. My intuition (nothing more) tells me that the effectiveness of intake/exhaust mods is cumulative, and I wanted to remove any bottlenecks I could, so I was willing to take a shot on the plenum on a leap of faith since I was paying for labor on the other mods anyway and wanted to be done with the mods in one shot.

Bottom line -- I agree with Ken that the cats should definitely be your first mod if you're looking for bolt-on power, but don't expect anywhere near 30hp. If I were in your shoes, I'd hold out for a 997.2.

 

KonaKai: LOL. I knew I was taking a chance opening up that can of worms. Thanks for keeping it from popping wide open again.

I totally agree with your comments.

 

53% of original msrp not a penny more

 

I've heard the plenum gets you about ~ 20 hp. I like the sound of the 3.8. I also heard the PASM was updated going from 997.1 to 997.2, is that true ? The PASM felt kinda rough in the 2008.