Well, i guess it's my turn to jump in here. First off, i want to thank everyone for sharing their R&D and experiences. Together we all should be able to TWEAK our GT's a bit more and safely. I took about 15 mins to install the HBC with the info learned here. Sure enough, it's a different car. I'm still tweaking but as of now it spikes to 13-14, drops back to 8-10. I have only removed the white air box silencer, K&N drop in and a 2.5" duals. This is a no-brainer for $50. Keep checking out the SRT-4 forums to "KEEP UP WITH THE JONE'S" Those guys are doing some mad modding over there! Thanks again!
Kevin & Donna's Elec Blue GT
http://www.dreamcruisers.org/index/Page_1x.html