Thanks for posting this, Normy.
I am the inventor of the RediRad adapter and for guys whose pipes don't drown out the radio and who also want to preserve originality, the RediRad is a great alternative to $500+ conversions or unsightly, chinese-made aftermarket equipment among an otherwise stock collector car's interior.
Consider this
demo video
Also, Brillo, please contact me about any distortion concerns; we have recently made some changes to the design to account for certain portable music players on the market. Our tech line is 262 646 3363, Monday - Friday, 8 - 5 central time.
Main thing, please keep in mind that we are car people, too, who want to provide excellent customer service and American-made products. Not the norm these days!!
~Matt