The car will have an o/r X on it this weekend, and I'll see how that sounds with the 50 series, but if I'm not crazy about it I'm going to be looking for some new mufflers. I will also be doing my h/c/i soon. I drive it just about every day in the summer, so it might end up too loud with the SLPs, but I love how they sound. You can be the guinea pig 1990Coupe. Buy them and let me know