you can use the old carpet, I'm not sure if it's glued, I don't think it is...dynamat is not very expensive, here in the USA some car stereo shops will install it for a fee
It's much easier to work with carpet in a warm environment, summer day, it's more pliable
1995 Mustang GT Cnv 427 stroker
1996 Cobra with Kenne Bell 2.1 Supercharger dynoed at 12psi: makes 412whp/424wtq on E85: 250K miles on stock engine
2003 Infiniti M45 V8 340 hp
"What do you do besides drive fast?" "Have fun...."