well the secondary turbos are weak in the 13b rew, they usually break. youd be better off with a t2 swap, its hard enough. with the rew youd need to move mounts and do a lot more work to just have to wory about the secondary turbo. no to mention theyre expensive engines, the s4 t2 is only like $1800 with every thing (trans ecu harness ect.) g/l finding a good 13b rew under $2k