...and very happy!

Now, my new ECM (with decreased throttle sensetivity) doesn't annoy me so much, because now when I want to accelerate immediatly I just use my left paddle

The only problem is that I hear springs inside paddles vibrating now, when just cruising. Anyone experienced that?

 

^that doesnt sound right at all, shouldnt be any springs vibrating.

 

Well, maybe you need to be me to hear those springs rattles =) But my car is very quiet inside (almost no rattles) and even when I pull those paddles I can hear their springs a little and during cruising I hear them too, though my girlfriend doesn't

 

Honestly, if is rattling to the point you say it is, you should open everything back up and see if you missed something when tightening everything down. If you're confident you did, contact whoever you bought them from (assuming Riverside) and arrange to have them replaced on warranty as you have a defective part.

 

Infiniti would cover something under warranty that wasn't factory installed?

 

Well, the sound is so quiet, that I don't think somebody will change it (btw, I live in Ukraine and waited for them for about month =)). Let's suppose it's only me, who hear it...

 

if you can prove or convince them that the part was defective and in no way could your install have damaged/caused the problem, yes.

 

Bratko, if we suppose that only you can hear certain things, that is just not right and I recommend you seek help.

It may be that you just didn't tighten everything down right, try opening everything back up and make sure you "don't have any bolts loose".