OK so I'm dug around the forum a bit on this but no definite answer. If I do a muffler delete will the car actually lose power or/and torque like some say, if so why. I mean removing the muffler isn't going to create back pressure and contrary to belief back pressure does not help engines so what gives, just a myth or fact?
You will not loose power it is a myth.
The more you make the exhaust flow...the more power you will gain. A true dual can hurt performance but something like an H, X or Y pipe will benefit.
Obviously if you delete everything like headers and all yeah you will see power loss. You can really really improve these exhaust systems though they are bottle neck for the cars.
Are your A1 headers 4-2-1 stepped headers? If so, how much did you pay for them, if you don't mind me asking?
What do you think about the schmiedmann headers or the supersprint headers?
BTW, by any chance would you know the cell count of the OEM cats on the 540i, how about the popular magnaflow prevanos CA carb certified cats?
So if you chop a muffler off, JUST the muffler that's near the back end and NOT touch anything else (leave the resonators alone and such), will you lose a noticeable (or if any) amount of low rpm torque? Basically, same question as the OP. I am asking regarding any E39...525i all the way to M5.
You won't lose power I first had my resonator deleted then the rear silencer an had it like that for a couple months. But know I straight piped it from the resonator delet back to this. And I used all stainless the tips are 24inch long blast pipe style it gives it a crazy sound still all 2.5 inch pipe an no lose of power