Here is the shot I really like. You would not BELIEVE the TRASH I have seen in exhaust systems over the years. My favorite of all time is an exhaust system (manufacturer un-named) where the manufacturer welded a flange on a 2 inch exhaust pipe to bolt to the 4 in 1 collector. When the 2 inch pipe was bolted to the 4 inch collector, it lined up DIRECTLY IN CENTER of a 4 in 1 collector
The poor 2 inch tube (too small already) got MAYBE 1/2 of the exhaust it was supposed to. The back pressure on that engine must have been higher than the shop guys after a burrito run to Taco Bell.
The sad thing is some people simply don't know what they are buying. They buy on price alone...and they usually get what they pay for.