And btw where did you get your mufflers from?

 

it will automatically calculate it for you. depending on your wheel width, a wheel with 0 offset means you have equal distance between each side of the wheel.

example. if i have a wheel 15x10 and i have 0 offset. my wheel has 5 inch back space measured from the wheel mounting surface, to the edge of the wheel.

calculated, if i have a wheel like the one i shown here on this thread, it had -38mm offset, witch equals to 4" worth of backspace.

a wheel that will stick outward of the car from the center of the wheel mounting surface, is negative offset....

anything that "pushes" the wheel inward from the center of the wheel mounting surface is positive offset.

examples. a stock front wheel drive car, usually will use a positive offset wheel like a honda; 15x6 wheel, with +45 offset. you will notice these wheels have a fairly flat face on the outside of the wheel, while the inside looks really deep dished.

a wheel that has negative offset like the 15x10's shown above, have the reverse look and have a deeper dish on the outside of the wheel while the inside is shallower.

hope this didnt confuse the hell out of ya...

i ran my exhaust to tuck above the frame rails so i made my own pattern. mufflers come in many different positions. round canisters like the one you see in the pic, have a center in, center out design. you can make your exhaust run wherever you want it technically. IE out the back, out the stock exit, before the axle, and so on and so on.....

some oval mufflers will have a varyation of either, center in / center out, offset in / center out.... etc etc...

the design of the muffler just depends on where you need the pipe to be. here is another example of an exhaust i did for my buddy's 90 stadard cab where i used a offset / offset (meaning the in and out are on opposite sides of each other)

 

Damn bro this sort sounds a lil complicated lol..okay heres what i was planning on doing to mind,i was thinking of running my exhaust RIGHT DOWN THE CENTER OF TRUCK ND HAVE IT COME OUT RIGHT BELOW MY LICENSE PLATES BUT I WASNT SURE I SHOULD USE THE SAME PATTERN THAT MY STOCK HAS RIGHT NOW OR JUST DESIGN A WHOLE NEW ONE LIKE YOU MENTION

 

You're on the right track but you missed one thing. The lip on the wheel (from bead to edge) is about 1/2" thick. This will vary a little depending on whether the wheel is forged, cast, or spun but it is a good rule of thumb. The wheel width (the 10" in your example) is the width measured from inside bead to inside bead. The actual physical width is about 1" wider.

So in your example, the 15 X 10 will have a 5.5" backspace.

 

you can do essentially the same thing i did and run it over the axle and dump it right under the license plate. the only issue is your spare tire. i dont run one for this reason so i keep it in the bed on long trips. it can be done, its just a matter of bending the exhaust tubing to get it there.

im sorry, yes, you are correct. most wheels i have found to have between a 1/4" to 1/2" rolled lip for the bead on each side. so yes, you will end up with like a 15x10.5 inch wheel, total width.

 

question

where did you get the 15x10 wheel

 

I can't vouch for him but you can get them HERE.

They look great SD!