how much longer is the tri y hytech header and also the rmf narrow header vs. a normal gsr header. Figuring out if it will clear my aftermarket cat (positioned further back then stock location) thanks in advance.

edit: just found after searching a little harder that its 8.5" longer is this true?

 

The RMF narrow replica that I got from Vteckidd is the exact same length as the ebay 4-1 that I used to have so it should fit fine. However, the tri-y would be longer than that but how much longer? I'm not sure because I've never put one on my car.