When and how much do you think they will cost?

 

very very soon, how much I have no idea but best to contact Accolade parts they will be dealing with the RPW Race design 4-1 mandrel bent - from someone that has a set they are awesome... and I only had the smaller type the larger ones get fitted onto the car today and Iwill be racing with them on saturday

 

Accolade said that they are going to have an initial GB for the first 20 headers from RPW. One without a cat is going to be $450 and one with a high flow cat will be $570.

The rumors that I've heard for RRM is that one with a high flow cat will be $589 so I would guess that the one without a cat will be around $450 - $470.