Thermal 2.5" with black tips. I dropped it off an hour ago, and they are already done. I've used this shop for 20+ years, and when he called, the guy said he was surprised that, for a 6-cylinder, it actually has a really great sound—picking up at lunch. I'll be glad for those dinky chrome tips to be gone. I'm just not overly impressed with the chrome and this color wheel tint combo. Larger black tips will be an improvement.