What makes a $50 test pipe different from the $200 ones? im trying to find one with a resonator but i just wanted to know what makes the difference before i buy one. any experiences?

 

anything blocking gasses will remove whp


I noticed the cheap stuff doesn't last long
just need good strong welds

 

Unfortunately, I yet can not tell from my experience but I think that the only explanation is name and/or quality (if any different).
Personally I think that there is no chance for a better design of that part.
o2 housing/DP yes, overall design of the exhaust, yes, but not just straight pipe.
In my opinion it is not worth paying more for just a name.

 

IMO, Quality. But it doesbt mean 200 ones are best quality, some cost little more its cause the name.
I would go search down each brand name, set your budget and hear opnion from vendor. Good luck