I run the slps on my regal. I had the ssac on my gp. The slps were ceramic coated and didn't look like **** after 3 start ups. The ssac headers ticked from day 1. I ran the slps about a year, then had to replace the flex section (ebay, $30). If you're on a budget, the ssac or "speedy daddy" is the way to go, but i would recommend getting them coated.
Feel confident in your purchase, you have a good product.