It seemed to be quicker when I did my installs last but I did put on the efans with it so I'm not sure. I may take it out to see if it runs any better.

 

i think it wont help to take it off unless you take off the lead wheels

 

LOL maybe I will do like the Cavalier out there and take my intake off to make it quicker.

 

When I first ran my truck with a bed cover fake duals and a tb spacer it ran a 16.5, I took off the cover and Tb spacer and dropped to a 15.9. I would say take off the tb spacer and see how you do. Of course now am at 13.8's so I am much happier now.

 

I have a bed cover as well. I think next time I go out to the track I will take a few tools out and make a run with the spacer on, make a run with it off, and make a run with the cover off as well. I should hopefully see at least 15.1s with factory wheels back on so I will test a few things out and see what works best.