R53 owner looking for some help on my build

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Oct 12, 2025 | 08:49 PM
  #1  
Hello, all!
looking for a little support on my R53. I'm currently running a stock SC with a %15 pully and 2% underdrive, but have a sprintex SC on hand ready to install and looking at 60mm pully for it. JCW 380 injectors (from what i understand, as big as i can go without a tune), alta cold air, catless exhaust with black widow neighbor hater mufflers, and a megan header. I think I'm alright right now with the stock SC, though I do think it could make more power with a tune. Don't feel it's running it's best. But work the sprintex, I'm sure I'll need a tune. Can anyone point me in the right direction in this?
Thanks for having me
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