Thanks for the info. Im at the stock rev limit and at 100foot sea level. I've spoken to Douglas also and he advised me to tune the low throttle% at 500/900/1400rpm 49%/50% hi-lo setting then take it from there. Im pretty sure the car can start with these injectors without sputtering on a 4inch intake. Forgot to say Im on longtube headers with a Perdue custom y-pipe 3 inch collector.

 

updates:

-I installed the 4inch intake with the oe MAF, 45 degree 4inch to 3.5inch coupler and a Vibrant velocity stack along with the Vibrant air filter.

-I installed the R35 injectors with the OE upper and lower injector seals, they are 100% plug and play.

-I began by setting my Vafc2 at low level rpm settings of 1000/1200/1400/1700/2000/2200/2400/2600 to make sure I have enough adjustment range to get good AFR's when cruising.
-My low/hi setting is 49%/50%.
- When cold starting adjusted at -4% 1000 to 1600, the car idles at 14.8/15.2 until warmed. fine.
-Then, when hot, then idle dip below 1000 (where my first adjustment is and cant go any lower) the AFR get to 17.0, 16,8 and even leaner, the ECU hunts for a fuel map to keep the engine without sputtering, a slight gas pedal tug gets the help it needs. It seems the ecu can readjust itself to get a "correct" but not as perfect with OE injectors and maf. I keep you posted in a while if it cant stay well mannered.

Road test: acceleration is stronger as soon as takeoff, pickup is better, I get afrs of 14.x without any adjustments. There's room for improvement and hidden horsepower left in the tune. Im already pleased and surprised by the results

 

I took my car to get groceries yesterday and the dreaded p0300 came on. The exhaust note was popping, AFR was super lean around 18.0 then dipped below until the gauge displayed ---

I gave it some gas which seemed to solve the problem but when I got back home, it was still vibrating at idle and quite down on power but revved smootly, not like running on 5 or less cylinders...

 

Ever figure out the problem?