This is the unequal length header that replaces the OEM header/primary cat as well as the secondary cat on the GK5. Bolts in like factory. Gets rid of the donut gasket in favor of a v band and flex pipe. Still retains the egr system. 
2" and 2.25" piping avaliable
Available with or without a highflow cat.
These are made to order and lead times very depending on how many orders I have in the queue.
***international shipping available. contact me directly for an accurate price with shipping***