BCredliner,
I'm more trying to add my thoughts on what you said for the original poster's sake rather than being argumentative I apologize if it reads otherwise.
QUOTE=bcredliner;1057129]Per 2002 Dinan Catalog the cold air intake system added 13 bhp at 5,700 rpms and 12 lb/ft. of torque at 5,700 rpms. The CAI alone will never deliver these numbers on its own. DINAN is bending the facts a tad. You need the other stuff to see any real world gains. MAF, throttle body, engine software modification, exhaust with performance cats etc.

Dinan tunes are historically on the conservative side though they are designed to match to Dinan Mods. I suggest adding the Dinan transmission software rather than Dinan Stage 2 tune since you already have a tune. The transmission software makes a big difference and is well worth the cost. Trans software is a huge improvement but you can get a similar update for much less $ if you look around. As for the engine software---For a better hp:cost ratio of around $200-250 you can get better tunes from a local guy on Craigslist I've found or even ebay. They'll usually give you a copy of your original file and can tweak it after the flash to customize it for your needs and conditions.

More air means more air out. There will be benefit from lower back pressure mufflers and a better sound comes with them.[/QUOTE]

Adding headers and performance cats then a free flow muffler will do a ton. Running stock pipes and a fancy muffler will sound good

I did the whole Dinan dance on my last e39 540i 320hp. I didn't go with a supercharger but I was faster and sounded better than other 540i's but not anywhere near keeping up with an M5 at 400hp.

I thought about doing a Dinan CAI on the wife's 4.6is but after looking at her air box, I decided it was about as good a design as it gets and I would in no way have improved upon it with a CAI. Some very good evidence has come out stating that warmer air allows the fuel to burn better after more fully vaporizing by mixing with the warm (hot) air and that cold air unless turbo or supercharged and forced into the plenum is/can be derogatory to performance on some vehicles. Dyno test after dyno test have me believing the new math. CAI's sound/look cool but do very little on these bimmers compared to stock intakes which are already pretty amazing on e53's.

Just my 2 cents.