MAC Trottle Body, etc..

[silver_pilate]

I agree that the 70mm TB may be a bit big for your current setup. I would bet that a larger MAF would help you out about as much as a larger TB would. Also, you can go pretty big on the MAF since all it does is meter the air coming in. It's just a restricition in the air path. I went with the 76mm C&L unit and have been very pleased. I got a GREAT deal on it through JD's Performance in a group purchase. Also, it's made so you can swap out sampling tubes when you change injectors rather than having to send it off to calibrate it. And it comes with a line aluminum inlet elbow. I'd do something like that and then if you insist on fender induction, I'd get a Morosso kit...cheaper and better made than the BBK units, and it only goes from the MAF to the fender.

The decision is up to you. Remember, you're only going to flow as well as the least flowing part of your combo. Eventually, you are going to need both a MAF and a TB, and if you go with heads and intake in the future, a 70mm TB probably won't hurt you. However, with your current setup, you will likely lose some down low torque, and 65mm TB's have been shown to flow plenty of air for big horsepower.

I run the MAC 70mm on my combo, and I'm pleased with it, although like HiFlow stated, it whistles on occasion. One more thing, MAC was back-ordered on their EGR spacers, so they only sent me the TB...like that would do me any good! I was in a rush, so JD's, who I ordered from, ended up eating the cost of an Accufab spacer and overnighting it to me (there's quality customer service for you...thanks JD's), and let me tell you, I was blown away by the extreme quality of product that Accufab puts out. If I had the extra $$$, I would have sprung for the TB from them as well.

--nathan