[FRSBRZGT86FAN]

Originally Posted by ThatYeti

Everything I'd read showed the grimmspeed box as a direct replacement for the factory box (only did it to get a little extra space for the oil cooler) and haven't had any issues running the OFT stage one for a bit now. Did you have issues running it?

Originally Posted by spcmafia

If I remember correctly, there is a tune that is specific to the Grimmspeed box. I'll find it. I didn't invest money on that piece of hardware. I just use an aftermarket filter and inlet tube.



You wouldn't necessarily run into problems by just using the Stage 1-2, but you could possibly be missing out on a couple extra HP because the tune is not optimized for that box. You should get in contact with anyone who does custom tunes, trust me, it is worth it, and you won't have a generic tune, you''l have something that it is optimized for every aftermarket part you have.

If wayno/steve99 are busy and you have some technical knowledge, you could follow their guide to do the maf scaling yourself. That's where the performance optimization comes from with the airboxes on that gen.