I think it has 4 10s with a zf5...I'm not for sure what the tire size is but my rims are 16s....I thought about running 4 inch from the y pipe and then a set of 5 or 6 inch stacks. I did see a few options for a 3 inch y pipe toCheck the timing registry thread, see if there’s someone close to you with equipment. I personally don’t think a cai will help a n/a idi but larger exhaust will. I dropped 100 degrees when I ran 4” off the factory y pipe. Dropped almost another 100 after I installed a new pump, injectors, and set timing to 8.6. What gears, trans, and tire size does your truck have? Mine had 3.07s in a dana 61, swapped to 3.73s in a 10.25 and it felt like a new motor lol. I plan to stud and turbo the truck soon even with everything I’ve done, it still doesn’t tow as well as I’d like. 10k feels like 20. I’d get your truck timed correctly and if your still not happy, start shopping for turbos new or used
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