I originallly started a thread on this in the Modern area; however, based on the information I received, I think my questions are now heading more in a technical direction. Essentially, I'm looking to remove the pre-cats on a CS. My initial thought was to replace the stock manifold with either a 360 Challenge or Euro spec part (apparently they're the same part number). This seemed like a feasible solution until it was mentioned that the Challenge/Euro manifold doesn't have provisions for the air injection set-up. Is anyone aware of workarounds for this problem? Another suggestion was to gut the pre-cats out of a set of stock manifolds. This would take care of the air injection system, but could have a negative impact on the flow of the mainfold itself. Ideally, there would be an aftermarket solution for this. Unfortunately, it sounds like no one is currently making 360 headers for US spec cars. Short of an aftermarket part eventually becoming available, I don't know if I'm just opening a can of worms trying to make a different solution work. Thanks in advance for any info/guidance.