aprevo15

There's a shop called Kenny's Mufflers in Cypress. They did mine. Charged me $70 to do it. I took it there because the guy has done the job on other S2000's.

Brian617

Kenny's Muffler is charging more than double that now. I called Kenny's, Speedway Muffler in Rowland Heights, and Advance Tire & Muffler in Long Beach. All are charging $150 plus or minus. I got the UK mod done at Advance Tire & Muffler today with a 44mm pipe and I'm happy with the work and overall sound. They took the catback completely off and welded on the ground. You can ask for John or Darren if you want to get it done.

It seems every shop that once did it for $60-70 eventually brought their price up to $150ish after doing the mod multiple times and realizing the work involved. You might get a random muffler shop to do it cheap the first time they try it, but I didn't want to risk getting my OEM exhaust hacked up.