MJ,

Good to read that you found the source and fix for the vibration. This information is good for others, as well, whom will be installing the same related mods.

Deane (RBull) pointed something out to all, which I myself failed to check. Be sure, after a few days time, to recheck your plenum bolts. As with Deane's bolts . . . My perimeter plenum bolts were still seated at the original 100 inch-ilbs. However, with regard the six center plenum bolts (numbered 1 through 6) that sit in middle on the top of the upper collector . . . I had a few which had gotten just a tiny bit loose and they needed to be retorqued down to the specified 60 inch-lbs.

 

I bought the lower plenum portion of the MREV kit to go along with a Crawford upper plenum.The two together make quite a difference in performance,the thing I notice the most is growling sound at about 2700-2800 rpm's.I installed the lower portion last weekend so I will be retorquing the bolts this weekend,Has anyone else noticed a similar sound after similer installation.
Mark

 

Thanks guys.
Now. my G runs very good.
pretty big differnece in low end.
everything is clear.
sorry for the delay on update.
I have no internet connection and waiting for new ISP done untill next week.
see you guys soon!

 

isn't doing both M-rev package and crawford upper plunum redundent? (unless you meant you only got the m-rev lower plenum and not the complete spacer package....)