Building a chev with a cummins 12 valve. Looking to sound proof my cab a little. Does anyone know where to get rubber with felt on the back that I can mold to the firewall like some of the old factory diesels? sorry if I am in the wrong area but did not know were else to ask thanks for any consideration or advice.

 

have you looked at Dynamat?

 

quiet car is susposed to be a good product, that has better results than dynamat and is spray on or roll on
no first hand experience, just based off of internet search

 

I know some of the guys on RCC and 4btswaps have used bedliner on their firewalls. Not the stuff in a can, the real deal like Line-X. I'm not sure how it holds up near the downpipe, though. You might be able to use some reflective aluminum insualtion there.

 

I've heard a lot of good things about these guys.

Second Skin Audio

 

I used "B-Quiet Ultimate on my hood and liked the result.

Here's a link: http://www.b-quiet.com/ultimate.html

Good luck!

 

Couldn't you also just do it on the inside of the cab and have the same effect.

 

This product has great reviews too - heard about them years ago. Do a search. If I were going to do it and want it done well, this is what I would go with.

http://www.raammat.com/

 

I thought about something like this for my Chevy. It appears to be a pre-cut kit that goes inside. I have never tried it but looked interesting. Some Silverados had added insulation under the cowl but most of that stuff is used up and ragged by now.

http://www.quietride.com/acoustishield.html

If it is a 80's model...

http://www.parts123.com/parts123/yb.dll?parta~partsort

The ABS firewall and rear cab cover may help a lot.