i am converting my single exhaust into dual on Friday, january 25...and was wondering if i will burn more gas(naturally will burn more but)...will it be excessive...should i just get the single replaced and not go dual..... Secondly, i have a buzzing sound that just started on monday...whenever i turn my driving lights on it starts about 20 to 30 seconds after...it is somehow connected to the radio(i guess thru the electrical system)..i mean to say that when i turn the radio volume up the buzzing sound can be heard thru the radio( i mean it disrupts the radio)...the sound only happens when the driving or night-time light are on...the parking lights are fine...i mean no sound is heard...what do u think the problem could be...faulty electrical wiring or just an old car falling apart... _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com/intl.asp.