Ron, I may be going against the grain here but I don't feel it is one of the have to have instruments. I was perfactly happy monitoring the exhaust temps and still do. now having said that I treat it more as a back up for me to verify information. I have gone to the extreme this past year of installing a sensor on each stack and installing a switch to go from side to side to compare (and they are different). As i update instruments I discover that I may or may notwant to keep something else. The g meter comes to mind right now. I could go without that too. The obstruction in the exhaust stream I had wondered about also but it seems to be a non issue and made no noticeable diffrence in temps or power. Joe Horton ____________________________________________________________ SHOCKING: 2010 Honda Civic for $1,732.09 SPECIAL REPORT: High ticket items are being auctioned for an incredible 90% off! http://thirdpartyoffers.juno.com/TGL3141/4c444a9b6043e3365abst03duc