I've gained so much knowledge from this forum and never really had much to give, that hasn't already been mentioned. I came across something this summer that really helped the problems I was having so I thought I'd share and maybe save someone else a headache. This spring I dumped quite a bit of money into my car. Mainly blower swap and full Fore return fuel system. I ended up going with a dead head setup since so many have good luck with it here and I really like how clean it looks just having two lines running into the back of each rail. After getting everything installed I started the process of remote tuning. Revision after revision it became apparent that at 2500 rpm I was getting a lean spike that wasn't going away. I could see it on my wideband but more so I could feel and hear it popping at that spot consistently. My tuner was very good at trying a bunch of different things, messing with transient fuel and trying to tune it out but no matter what was added it was still there. Finally at my wits end I took to google and figured someone else has to have some info on a similar problem. After spending a decent amount of time searching I came across some old info on a Nissan forum that talked about having a factory fuel pulse damper that smooths out harmonics in the fuel system and how one guy had low rpm lean spikes after removing it. This gave me a direction and something to at least try. After a quick search I came across the company "Radium" that sells aftermarket fuel pulse dampers for high pressure/flow fuel systems. Fuel Pulse Damper, Direct Mount Kits I figured what the hell it's worth a shot for $100. So I ordered a damper that I could adapt to thread into my fuel rail. After I received/installed it, On the first test drive I was completely blown away. I spent a good part of my summer with numerous tune revisions and with a 15 min install and $100 that lean spot was gone. Car ran amazing and absolutely zero lean spike. I did have to get another tune revision to take some of the fuel out of that spot that was added when trying to mask it. In no way am I working for or even know anyone from Radium but their product flat out worked for me and cured a lot of headaches and I thought I'd share.