The pipes are either welded together seamlessly, or in the case of connecting to cats/mufflers etc there might be a few mm difference so the pipe can slide over the join snug.Pipe = 2"
Catalytic Converter = 2" (both inlet and outlet)
Muffler = 2" (both inlet and outlet)
Resonator = 2" (both inlet and outlet)
Exhaust Tip = 2" (both inlet and outlet)
It just doesn't make sense to me because if everything above was 2", how would they fit/connect with each other when putting it together?
I'm new to VWs but I would think replacing the existing two litre system with a 2" or 2.25" mandrel bent system would be your best bet, using one less muffler and possibly changing an existing muffler with something 'straight through' or more free-flowing.
If the diametre of the exhaust is too big there will be a loss in back-pressure; meaning exhaust gases will exit the system slower, which will result in a loss of power. Here's a really bad example but I'll try my best anyway... Just imagine when you drink through a straw - if it is small like those found in small tetra juice/prima boxes, you get a decent rate of liquid sucked up (like your stock exhaust which does the job efficiently enough). If you use a thicker straw like one from McDonalds (a slightly bigger diametre exhaust system) you suck in more liquid with comparable/less effort. But going bigger again like the diametre of a toilet roll (2.5"-3" on a standard two litre) you would struggle to suck up anything because you can't suck in as much (unless you had turbocharged lungs!).
It's all about comprimising for efficiency. Too small and it's hard for anything to pass through, too big and the rate that air moves slows down. The gains you get will be negligible, but if it's what you want to do and your bro is paying for it then go for it!!
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