[spcmafia]

Originally Posted by ThatYeti

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!!