If he is using what I think it is, it's Dynamat Extreme and is a waste of money putting it in the roof between the headliner and the roof. I used the regular Dynamat in the roof's of both Hornet's. The yellow one 4-5 years ago and the orange one almost 2 years ago. The silver (Extreme) is good on the floors and firewall where there is engine and and exhaust heat. The yellow car got the extreme on the firewall and the floor since it will have a V8 duel exhaust swap eventually. The orange 6 cyl car only got it on the drivers side interior floor where the 6 cyl single exhaust run's. "Doc" Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/BaadAssGremlins/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/BaadAssGremlins/join (Yahoo! ID required) <*> To change settings via email: mailto:BaadAssGremlins-digest@xxxxxxxxxxxxxxx mailto:BaadAssGremlins-fullfeatured@xxxxxxxxxxxxxxx <*> To unsubscribe from this group, send an email to: BaadAssGremlins-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/