That was why I was impressed with Marty as he said that as long as I stay with a 4ohm sub, I won't need an amp.
(i.e. he wasn't overselling just to make extra $$$)
I got a rough estimate of around $500 for a new 4 ohm free air 8 inch, spacer to fit the 8 inch into the 7.5 inch hole and I also wanted Dynamatting to the metal shelf and shelf cover (that has the speaker grille in it). Basically, I didn't want it to look any different to it does now.
For $500, that would have been a decent amount of work so the price seemed pretty good.

