I've got my S15 up for sale and have had some viewings. The downfall so far is the turbo lag. I currently have a PTE 5858SP which going off what I've read online falls between a GT3076R and a GT3582R in the Garrett family. The boost doesn't kick in till about 4k rpms. Everyone that's driven it has been dissapointed that it takes so long to kick in, but once it does kick in, it pulls hard. Would a good tuning/map job help in dropping down the lag, or would it be best to sell/trade this turbo for a smaller one that kicks in quicker? Anyone have any recommendations on a turbo? Thanks.