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Old 05-16-2022, 11:37 AM   #1
ThatYeti
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Which OFT stage for '17+ w/catted header?

Realize I'll be in the minority but have a catted FTspeed header I'll be installing and the car is a stock '17 with a JR oil cooler, Grimspeed airbox, and an OFT stage one already but haven't been able to find which stage is right to use. Heard/read that stage one is still sufficient given the limited flow from the catted header but swear I'd seen it listed on a thread a while ago that stage 2 was the correct tune once you had a header even if it was catted.

Tried the search function and didn't have much luck as there's too many threads that reference all of this (most of which are long for sale threads) so I appreciate the help in advance.


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Old 05-16-2022, 12:25 PM   #2
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Oops, now i remember


https://support.openflashtablet.com/...e-requirements
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Old 05-16-2022, 12:28 PM   #3
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stage1 for stock header
stage2 for catted aftermarket header
stage2+ uncatted/E85

honestly i just tune with stage2+ cam. timing even catted headers, and keep a little richer and less timing
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Old 05-16-2022, 01:32 PM   #4
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Appreciate it gents, didn't think to check the OFT site....it's definitely Monday and all that plasti-dip spray from doing a set of wheels last night is having it's effect...haha
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Old 05-17-2022, 06:35 AM   #5
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Quote:
Originally Posted by ThatYeti View Post
Realize I'll be in the minority but have a catted FTspeed header I'll be installing and the car is a stock '17 with a JR oil cooler, Grimspeed airbox, and an OFT stage one already but haven't been able to find which stage is right to use. Heard/read that stage one is still sufficient given the limited flow from the catted header but swear I'd seen it listed on a thread a while ago that stage 2 was the correct tune once you had a header even if it was catted.

Tried the search function and didn't have much luck as there's too many threads that reference all of this (most of which are long for sale threads) so I appreciate the help in advance.


Thanks

You would need a Stage 2 as a base but will definitely need a custom tune from Steve99 or Wayno because of the Grimmspeed Airbox.



Stage 1 Hardware Requirements:
  • OEM header. *Any exhaust modifications after the header is also compatible
  • Stock Airbox (with or without aftermarket drop-in panel filter)
  • Premium grade fuel


Stage 2 Hardware Requirements:
  • Aftermarket CATTED header. *Any exhaust modifications after the header is also compatible
  • Stock Airbox (with or without aftermarket drop-in panel filter)
  • Premium grade fuel


Stage 2+ Hardware Requirements:
  • Aftermarket CAT-LESS header. *Any exhaust modifications after the header is also compatible
  • Stock Airbox (with or without aftermarket drop-in panel filter)
  • Premium grade fuel


Stage 2+ (E85) Hardware Requirements:
  • Stock OR Aftermarket CATTED OR CAT-LESS header. *Any exhaust modifications after the header is also compatible
  • Stock Airbox (with or without aftermarket drop-in panel filter)
  • E85 fuel ONLY!!
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Old 05-17-2022, 07:50 AM   #6
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Quote:
Originally Posted by spcmafia View Post
You would need a Stage 2 as a base but will definitely need a custom tune from Steve99 or Wayno because of the Grimmspeed Airbox.



Stage 1 Hardware Requirements:
  • OEM header. *Any exhaust modifications after the header is also compatible
  • Stock Airbox (with or without aftermarket drop-in panel filter)
  • Premium grade fuel


Stage 2 Hardware Requirements:
  • Aftermarket CATTED header. *Any exhaust modifications after the header is also compatible
  • Stock Airbox (with or without aftermarket drop-in panel filter)
  • Premium grade fuel


Stage 2+ Hardware Requirements:
  • Aftermarket CAT-LESS header. *Any exhaust modifications after the header is also compatible
  • Stock Airbox (with or without aftermarket drop-in panel filter)
  • Premium grade fuel


Stage 2+ (E85) Hardware Requirements:
  • Stock OR Aftermarket CATTED OR CAT-LESS header. *Any exhaust modifications after the header is also compatible
  • Stock Airbox (with or without aftermarket drop-in panel filter)
  • E85 fuel ONLY!!
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?
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Old 05-17-2022, 07:57 AM   #7
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Quote:
Originally Posted by ThatYeti View Post
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?

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.
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Old 05-17-2022, 08:07 AM   #8
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Quote:
Originally Posted by spcmafia View Post
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.
Fair enough, though I may not be keeping the airbox long term as it's rubbing one of the hose end nuts where it connects to the oil filter spacer so I may just stick with a shelf tune til I sort that out so I'm not wasting money on multiple tunes.
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Old 05-17-2022, 08:16 AM   #9
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Quote:
Originally Posted by ThatYeti View Post
Fair enough, though I may not be keeping the airbox long term as it's rubbing one of the hose end nuts where it connects to the oil filter spacer so I may just stick with a shelf tune til I sort that out so I'm not wasting money on multiple tunes.

BTW, didn't realize you're from CT! What part?!



You can always switch back to stock, sell your GS box, get an inlet tube and K&N filter for $120-ish, switch to Stage 2 once you install your headers, if you haven't done so. I also run catted headers and even a double resonated Front Pipe. Rather not worry about emissions and salty cops.
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Old 05-17-2022, 10:51 AM   #10
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Quote:
Originally Posted by spcmafia View Post
BTW, didn't realize you're from CT! What part?!



You can always switch back to stock, sell your GS box, get an inlet tube and K&N filter for $120-ish, switch to Stage 2 once you install your headers, if you haven't done so. I also run catted headers and even a double resonated Front Pipe. Rather not worry about emissions and salty cops.
I'm up near Bradley and the stock box gave me less space so i'd have to find something that's smaller or get the right JR oil cooler kit for my car (one I bought here was for an earlier auto...seller didn't mention that til after he shipped and I didn't know to ask) Same thoughts on keeping it catted but doing the headers this week.
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Old 05-23-2022, 09:22 PM   #11
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Quote:
Originally Posted by ThatYeti View Post
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?
Quote:
Originally Posted by spcmafia View Post
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.
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