Back Pressure - Myth or Fact?

[robtek]

Hey guys,

The first modification to my exhaust system, was all 3 mufflers removed..and 3 big hotdogs put into their places...the sound was VERY, VERY deep but ended up blowing out my cat:P...was crap low end, but high end was good,(this was done prior to any other mods;))..then due to insurance purposes...I had the extractors and 2.5inch system fitted with highflow cat...only one straight through muffler exists...but it is no where near as fat or deep...

Q: 50% of places/mechanics/wreckers/others told me back pressure is a myth and mufflers are only their to damp the noise..

Other 50% of places told me without back pressure im going to do major damage to my engine, and performance will be shithouse, unless I am on a circular race track :P...which is true?...ive done abit of research but the arguemnt still sways 50/50 ...anyone can relate or answer with a personal example??

I just want that DEEP fat noise back:(..not sure if i should waste $$ for a couple more hotdogs..

Thanks guys

Big Rob