under carpet foam.

[16v_kid]

Mk1 is light enough, no need to lose weight

you sure about that...

its amazing how much you can lighten you mk1.

[AUC-05L]

clark rubber is where i go for underlay......

[RedMk2Gti]

I used newspaper in my Mk2

[dub be good to me]

I've got one in ok condition, you can have it if you can figure out postage/transport from VIC

[paulie71]

just a word of warning about sourcing backyard solutions or adlibbing with what you have (eg: newspapers etc.) Remember that most of the materials used in a car (even as old as the first Mk1's) may be fire resistant or have fire prevention properties.

I would suggest avoiding any material you feel might increase the likelihood of fire spreading inside the cabin. Yes there is fuel and/or oil and/or sparks in the engine bay and/or under the back seat, but these are exterior to the cabin. Newspaper is side the cabin as underlay might not be too fire resistant.

[pepperwhite]

I used some super lightweight foam panels from reverse garbage in brisbane. $5 for enough to get all my carpets fitting right.