I've had the header for about a year now, it works well, noticed a performance increase and sounded great when hooked up to my Yonaka exhaust system. Installing the header was easy, but I think it's a bit longer than my factory header. I had a tough time installing the exhaust system, I had to reinforce the exhaust system and make some modifications to the suspension to make it fit. However, when accelerating, I heard a faint creaking sound under the car. I put the screws back in and tightenedβ¦