My car has a inmotion tune but since adding the other half of a dual intake step colder plugs and a 75 shot wet can't hit the old times anymore,12.0-12.@114-116 on tsw rims and street tires.Given I only use the 75 shot in third gear,and its felt but I can only run 12.3 12.4 @114.Is its possible to lose a tune I replaced my battery last month,new crank sensor ordered a new crank sensor and changing the trans fluid and filter and oil next week,if my times don't change I may be maxing out my stock fuel pump.Any thoughts my mods are a code 3 pulley,dcai,need wings nodded Mani's,secondary car and resonator delete with 3inch piping,car made 364whp 360tq

 

Could you possibly not have the correct gap on the new colder plugs? And yes you may need to upgrade your pump. Just out of curiosity, where did you merge the two 2 1/4 pipes into one 3 inch? I just did this and merged into a Y about where the rear CATs had been, then straight into the muffler.

 

I checked the gap on the new plugs they are still gapped at .035 ,,but the car just hit 80 k so ,feel the stock pump is losing flow in the upper ROMs,one member up here was running low 12s at like 111 or something and replace the fuel pump and picked up 4-5 mph.don't get me wrong the car is strong 40 mph roll I can break the tires loose without nitrous ,then again it could be the track with a faulty timing system.I am just going to give the car a good once over get put it on a dyno and go from there.Thanks for the input