I just filled up and I averaged about 1.5 mpg better than before the downpipe install.

 

2 mpg, unless you do other mods with it. I know this for a fact. 22.5 before, and 24.5 after. FYI, I get 21.3 now

 

I installed the CAI and downpipe last night. I love the super charger sound. Its worth it all on its own The exhaust is even a little throatier. I don't notice much in the way of power, although I did a 0-60 and it does seem to pull slightly better, and it gets like a 2nd wind around 40mph during a 0-60. I'm going to fill up tonight and resist hearing the supercharger for a week and see how much milage I get. I'm going to borrow the tech 2 from work and see if I'm still getting 0 KR.

I wanted to check the temp diffarence and see if the CAI was doing its job, and I didn't have the tech 2 2 handy so I used the tmperature probe on my multimeter. Unfortunantly I didn't have any before #'s to compare to. After a hot soak at idle it was around 100 degrees in the cold air box, and was close to 170 under the hood. At 30 mph it was only 75 degrees in the box and still a 130 under the hood. I think its doing its job

 

Those mods are what are called "supporting" mods, you won't really FEEL much power from doing them, but they will support you in getting your goal of dropping your pulley belt size to increase boost (safely) and that's when you'll FEEL the mods.

 

I didn't expect too much of an increase, but I knew both mods were important if I wanted to go any farther with modding. Now the big question...what should we do next and what would be the cheapest thing to do?

 

new colder spark plugs, and a front stainless steel powerlog.

Check out the stickied thread on modifying a 3800 engine, go to the L67 and just read on that one.

 

I almost forgot about the sticky, lol. Thank you. I'll start with the plugs cause their cheap and hopefully have the power log within the next few months.