Insulation, Peel n seal and other budget insulation ideas

I'm in the middle of doing my interior and went with a cheaper knock-off of the fat-mat / Dynamat but by a company called Noico. About half the price with free shipping on eBay, so I gave it a shot. I'm actually really pleased with it. It's the same 50mil thickness, is butyl rubber and doesn't have the strong tar smell the other cheap companies have, and has the foil backing.

I only did a sheet of it so far to see how it sticks because I'm still trying to get my center console conversion brackets put in right before doing the full floor... The amount I bought was 25 sq.ft. and looks like it will do at least the full floor pan.

Noico 50 mil 25 sqft car Sound deadening mat, butyl automotive Sound Deadener, | eBay