5# pulley here, stepped up from a 2# one. No real track difference... just a lot more spinning (real **** poor track prep in Orlando lately).

Noticeable on the street... can pretty easily smoke the tires all the way through first AND second. Still hooks well if I don't just mat it off the line though... chirps a couple of times then hauls ash. Hopefully the Truck-Tracks will help the track situation when I get them on...

 

I have a 2# now, my 5# is in the garage with denso it24's..waiting on my newly tuned chip to do the install.. My truck is an almost daily driver so we'll see, hopefully no problem. I have an excellent guy workin on my chip. ..JR

 

I drove mine every day for 15000 miles half with stock plugs and a Diablo chip. pulled plugs and the look great, went the other half with TR-6's ran also just as good.
the only ping I ever had was when the IC went out and was empty and then it would only ping under Overdrive Load.

 

I had a 4lb lower and the metco upper(1-1.5lbs). It was on the truck less than 2 days and a rod went out the side of the block. Before that I ran nearly every day for 7K trouble free miles with the upper and 3lb lower. Total 15K miles on the truck.

(I don't want to hear the crap about bad tune because it wasn't the tune.)

 

Must have been bad luck :o

 

29,900 trouble-free miles with first a 2lb, then a 3lb, and now, a 5 lber. I stay out of the boost most of the time. All I do when I go to the track is remove the t/g and put the M/Ts on.

Dan

 

I have a JL 5 Lb lower and a Metco upper pulley. So far, so good, JL has my Diablo chip tuned fast and safe. Have Denso IT 20 plugs since I started with a 3 Lb JL lower pulley.

 

I think it was a weak factory rod.

 

Goodbye you are the weakest link!