Hey guys I'm new to the forum so sry if this thread is a copy cat but I've had my 04 ls for a little over a yr now and I'm ready to spice things up a little I've ordered my k&n cold air intake and have been interested In the performance chips but wanted to see if any one can offer a little feed back on if they really work and if so wat brands are legit...thanx for ur help in advance. ..