ive posted this elsewhere but i figured it could be useful here too
when i was doing my up pipes i did a lot of looking around for an easy way to tighten them up . all i was finding was pull out your tranny or inner fender, or remove your downpipe. this is the way i did it, and i got it tightened in under 4 minutes. my pictures are kind of on wierd angles but youll get the idea.
theres a hole between the cab and the frame on the passenger side right behind the cab mount/leafspring shackle. this is where youll be looking through to see the bolt heads
now take a look at the rear of your passenger side inner fender and youll see some "steps" in the bottom of it above the frame rail. you can either take that bolt out and pull the fender back a bit, or cut off the bottom step. i just cut off the step
grab about 28" of 3/8 extensions, a 10mm shallow socket and a 3/8 ratchet. feed your extensions between the upipe itself and the downpipe and its a straight shot to each bolt head.
tighten them up and your done. hope this helps someone out.