thank you all guys !!!!

Yes the hemi it's really tight, with 6.1 and 6.4 headers is even more tighter... the 6.1 is from a 2009 grand cherokee srt, very powerful and fun to drive in a 2 door... with ESP disabled it can burnout all 1st gear and a little of the 2nd with 37 cooper...
It has 425hp stock and now with exhaust and tune i should be around 450... nice even with the 545rfe

here we have some buddy with jeep and we enjoy using them, we also have a national meeting for jeep only which count around 500 jeep... for us is a really good number...

There are very few gasoline jk here, most of all are diesel with the 2.8 crd... while the v8 conversion can be around 10 - 12 in all italy...