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I believe the recommend the Stg1 tune for CAI/Exhaust etc, still running the stock header. Stg2 is recommended for those with bolt ons, including an aftermarket header iirc.
Graham (their tuner) provides excellent service. He'll help you if you have any questions or concerns, and once you send him a datalog he is pretty prompt at replying. In fact, a part I ordered was backordered when I got my tune, and Graham agreed to look over my datalogs once the part was installed just to make sure the tune was ok. That's pretty good service if you ask me. I still need to send him that log tho lol. Overall I am very happy with my tune from them, the butt dyno is happy, and I plan to go back to them if I decide to go e85 or run an aftermarket header.
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