c55 dyno and problems.

[GT-ER]

I'm putting this here as well since it's pretty much the same engine. I made a topic a while back about my buddy's C55 that I couldn't get it to spin it's tires if my life depended on it and it felt slow. A few days ago, on my way to the dyno, behold, the car would spin it's tires from a stop with EASE! WTF? It NEVER did this before and now it does it every time. So I put it on the dyno and got this: It had a renntech airbox and secondaries removed...nothing more. Look at the A/F ratio...it's STUPID lean. The cars Long Term Fuel Trims are also very high ( +17 to +19 ). Yet I get no codes with the scanner. I took the maf out today and cleaned it up real good and put everything back real nice and the LTFT don't change, they are still really high. Not only that, but now that car won't spin it's tires again. And get this, today I installed Kleeman headers and a complete dual exhaust....now the car feels EVEN SLOWER....WTF? What should I check?

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[320 dreamer]

you will get better responses from the c32/c55 section. this section all but dead in regards to performance