To day i had my 01 Cobra dynoed for the first time. I have the following mods below and the number were not as expected. I was looking at 300+ but my top numebrs were 288.4 rwhp and 289tq. I was like wtf! My numbers were fine up to the 5,000 rpm range where the power just drops about 10 on hp and tq. and then the power starts to go up at the pace it is supposed to and peaks at 288, which means that if it were to maintain the power increase like it is supposed to it would of peaked at 300+ plus for sure. I am running rich with the air/fuel at 14.5 at 3000 rpm range and then it goes to 12.1 all the way through that sorry ass 5000 rpm range when it goes down to 11.1 and the power goes down. I had my headers installed monday and just today the check engine light went on, could that be part of the problem? The shop said to change the spark plugs and get rid of the check engine light with a trip to the dealership or a custom tune chip. My car blows white smoke through the exhaust at WOT and when i turn the car on when it is hot. It smokes a tad on idle. Could this problem be all together? Any advice would be appreciated. Maybe my engine is not burning fuel properly, the smoke sux.