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I am not, but the guy I bought a mountune exhaust manifold from was and swore by it. Pretty sure all he said all he did for his build was basic bolt-ons and that Mountune HPFP (which is just a rebranded XtremeD) and was making 400+whp in a ST, it sounded pretty rowdy, so I wouldn't doubt his claims. I would check out Xtreme-Di – GDI Performance Parts. I think your other option is Livernois, but they don't tune with Cobb AP to my knowledge.
 

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I’m not sure he was running that on an ST as they use a completely different hpfp. And as far as I know no one makes one because I have tried for my 2.0.
Second you do not need the the mycal from Livernois to tune. You can tune the hpfp and injectors with any software. Just bolt on the pump and tune as usual.
He had a RS head lol, pretty cool guy tbh...gave me a killer deal on that part since he was going pte turbo!!!
 
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