I've had Borla "turbo" mufflers installed on vehicles for a long time, and just a couple months back, the 40665 on the 4Runner:
https://www.summitracing.com/parts/BOR-40665
Summit Racing matched the amazon price and had it to my doorstep for $103. A local shop welded into place like 40 to 60 dollars (forgot).
Wife and kids didn't even notice the difference in sound. I really like the sound on start-up and when getting on the gas. Otherwise, quiet and I have not found a drone yet. Side benefits:
- much better clearance below
- 12 pounds lighter
- improved gas mileage? wouldn't be surprised
- improved performance? feels like it...
