widen quarter panels
 

has anybody done it around here ? any info will be appreciated

What kind of car?

67 camaro running 345s and they stick out about 2.5 inches

eeek 2"
 

the best thing would be to go inwards,its alot cheaper.
I've widened a 2nd gen before. The rear panel and getting both sides square are the hardest parts.
A 67 would not be too bad to do. But your talking a 3" section.

Yeah,just mini tub it.
http://www.detroitspeed.com/MiniTubKit10.html

tub it
 

21st Century Street Machine has come up with a new mini-tub and they replace the stock frame rail with a mandrel bent one giving it more strength than the stock frame rail and it gives enough room for a 14 or 15 inch wide tire. ( how is that for one big run on) Give them a buzz. 704-243-1566

thanks for the info. I will check with them