Recently I lucked out in many ways by dating a woman who works for a national performance parts supplier. She can order parts at cost as long as she doesn't spend more than $2000.00 dollars a year. I asked her to check on a few things for my car. The first was a Borla exhaust which retailed in the catalog for $399.00. The at cost price would be $299.00. The other item I asked her to check on was one of the new G-tech's. The G-tech retails for $244.00 and cost would be $150.00 The point is that it sure opens my eyes to how much mark-up is on performance parts.