Thanks.
If you can weld, then weld the mufflers, tips, and pipes all together yourself then take it to a muffler shop and ask them to install it, it should be pretty cheap that way (unless you feel confident welding under your own car). Alternatively you can clamp it together, that's actually what I did with mine, and the mufflers themselves rusted before the clamps did. Welding is always a better choice though.