On the mid 80's engines, is there a needed amount of backpressure?
If so, what muffler is the best to achieve it? Right now I am running Turbo
'packs. I have been thinking of going to a quieter muffler set up but don't care to spend for it if it is not actually going to benefit me other than the noise level.

Also, EGR w/ one port. Where is the port supposed to be connected to?

thanks

Does anybody have any ideas on the back pressure?