By pp, you mean Professional Products? It will fit, just make sure you get the right size. Might have to be port-matched to your intake depending on the size.
There are 3 clips that hold it in... one on either side and another in the middle about where the mirror is... just pull real hard and it will come loose. the metal clips will sound like they're breaking, but it will be fine.
I've taken out over 100 lbs. with the sound deadening and rear seat delete. But gonna be puttin my subs and things back in soon... so prolly not too much of a reduction haha
Did you put the little rubber ball on the bottom tip of the shifter that goes into the tranny? That usually lowers vibrations and noise coming thru it.
No way the 275s fit up front. I have 275s out back with a 1/4" spacer and I have no problems. Quads are still mounted the same, not flipped. 245s out front don't rub at all except full lock usually.
Looking real nice so far...
And I thought redoing my interior was going to be a job... you got yourself a ton of work there... but it will be sooo awesome when it's done. I scraped all my sound deadening out of the interior too... glad yours came out as easy as mine!
best of luck!