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Message: [QUOTE="IdahoF350, post: 1403776, member: 2989"] Ok, sorry I don't get on here regularly enough. I tossed the stock box and intake piping on, didn't even attach the box, just set it there, lol. I have a 4" downpipe, then a 4" flex, a 4"x51" "muffler location" pipe built to the OAL of the muffler I plan to install this fall, then it turns up into my stack kit. The cat has 4" adapters on it to put it in place of the flex pipe for smog test only. I didn't even bother to open it up to 4", just adapted the 3.5" up to 4" since it only gets used a couple hours every other year. Don't buy a 6.7, gust keep the cat around. If it is gutted, that may become an issue some day, but for now, they don't do a function test (checking inlet vs outlet temp). If you want to run a bigger turbo, shiny is the enemy. It really needs to say Garrett on the cover. Since E99s are not that common, the tech won't know the difference unless he's a former Ford diesel tech or he's owned an E99 personally. Now, as for "chips" the tech may or may not look at your computer. Also, they may or may not have a clue what they are looking at. Personally, I run SCT, I do all my own tuning, and I prefer the chip and the ability to switch tunes on the fly. But I also have an old XCal2 that I can load files on and install in the truck. The beauty of this is I can run a tune with no chip installed, visually it looks stock. When I do injectors and HPOP this is how I plan to slide through smog, simply running it on a flashed program instead of one burned to the chip. Study their rules, learn what they test and what they look for, build the truck to work within those rules, and use their own system against them. As long as you aren't reported or stopped for rolling coal on the road, you'll never have an issue driving a modified 7.3 in California. [/QUOTE]