K&N Filters
I found the attached article regarding modifications to make the K&N application even better. Has anyone tried this?
I have found an easy "free" mod you can do to really help your Northstar breath better. It takes about 30 minutes with common hand tools. If you installed a K&N filter, this mod will help even more.
If you take your air filter out, you will notice a hole at the bottom of the air box. Believe it or not, this hole goes down to a "black box" that is COMPLETELY sealed. Go figure!? Not much fresh air coming through there. Go under the car, just in front of the driver's side front tire. Pull back the plastic liner that covers the bottom. Be careful when pulling out the plastic plug clips - there are two at the bottom front of the front tire's wheel well. Those should be the only ones you will need to snap off. Carefully pull back the liner. Once that liner is pulled back, you will see the "black box". Cut the bottom of the box out. I drilled a few holes first,
then used a hack saw blade and easily cut through the plastic. Sand the edges down smoothly. Once the bottom is removed, you will see the hole which leads up to the air filter. Finally, cut an approx. 8" x 6" hole out of the plastic liner directly under the box. GM was nice enough to give you an indentation to use as a template. Make the hole just large enough to allow the air to get up into the black box. Again, sand
the edges down smoothly. Carefully pull the liner back into position. Clip the two plastic clips back into place and you're ready to go! Optionally, I also removed the metal screen located in the throttle body to help further increase air flow
into the runners. But it's up to you if you want to do that.
Net result is that the throttle response is MUCH better and the Northstar really sucks some cool fresh air now. Also there is a great sound when you
punch the gas - but not overly loud or annoying. Good luck :flag