FJO makes a nice progressive controller that references TPS and RPM so no need for a switch. I have one and it works nice.
IDK whats done to your car but I'm at 93% dc on my stock injectors so I'd suggest starting with a wet kit, colder plugs, and pull some timing then read the plugs and go from there.
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2013 C63C AMG - 11.91@118.4 - 1.87 short
Diamond White w/Blk&Red - P31 & LSD
2002 SOM Trans Am WS6 - 10.85@123 - 1.44 short
1989 GTA - 10.50@129 - 1.47 short
1989 TTA - stock and slow
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