I pulled out my rear carpet to replace it and I figured while I have it out put some sound deadining mat down, but dynamat is fudging expensive! I was wondering if anyone has any good tips on home made sound deadining to put down before I get new carpet. And I'm not getting quieter exhaust, I like it loud but long trips are getting annoying with the exhaust resonating inside. Lol

 

Get some used acoustic ceiling tile from a Re-New used construction place. You may be able to find it in 1/4" but I'm not sure on how much it'll help.
Check out the local for sale ads as well.