Originally Posted by XDevolution
wouldnt running no muffler mean having low to no backpressure, straight pipe wouldnt be good on our cars at all from what ive heard. a buddy of mine said that the engine internals would run faster than normal(you rev to 5k and it shows on the tach but the engine is most like working at 6500k) and have higher wear probability. idk im not an expert just relaying info ive been told.
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The muffler wouldn't create much if any issues relating to back pressure due to the CAT. Most to all back pressure to the engine will be created between the cat and the engine. muffler purely muffles sound. I have run with no muffler on this and a 1st gen xb with no issues. Been that way pretty much since bought the car. I have no ill affect in performance.
I have run multiple vehicles with no muffler some trucks with straight pipe and open headers. with no major issues other than loud and obnoxious on some and maybe some performance drop. but that I don't mind lol. except this car is my wife's and I am not running it like that. Most 4banger do not benefit from striaght pipe without mods.
but v8 can in some cases improve with straight piping.
but issues with straight piping is laws regarding emissions. if you straight pipe and remove the CAT you are in violation. You can remove the muffler without violation other than possible sound ordinance if metered, but as far as emission muffler does not effect emissions.
---------- Post added at 01:46 PM ---------- Previous post was at 01:33 PM ----------
Basically the perfect exhaust would be one that creates the perfect "suction effect" for lack of terminology. It would just be the right size to allow air to move while creating enough pull (suction)from the cylinder to make sure it gets all spent gases out. To small or restrictive and the gases can't escape quick enough and the flow will be slow because of lack space to move and rob performance. To big or to little restriction and the flow will be slow because it is only being puched out by the piston movement thus creating no suction effect which can cause the gasses to move out slowly and not fluidly and again can cause loss of performance.