I need your guys help I live in Los Angeles and have a s13 with a sr20det I'm having trouble with it and I can't seem to find out what the deal it. What it does is that its lagging a bit and its making a small wistle, aside from th turbo of course, it was a bit louder and I changed the the stock manifold to an aftermarket TMnf and the gaskets around it but it calm down a lil bit I'm just looking for someone here in LA who can check it out please let me know. THX