Originally Posted by DS2k

I basically got a local shop to fabricate end pipes with stock mufflers. The switch between the two setups is as easy as lifting the rear end of the car and unbolting 4 bolts. The drone is COMPLETELY gone, and the noise level is very comparable to the stock setup.

I will have to do some dyno runs to document any change in power, but they only run I have with this setup didn't look promising, but that's mainly due to the K&N drop-in filter I had installed at the time.

Originally Posted by Compthis

Are you saying the simple K&N drop in filter was hindering the performance of your vehicle?

Originally Posted by DS2k

From what I was told, the K&N filter had fouled my A/F sensor which could have contributed to the loss of power.

Originally Posted by Compthis

Were you throwing a CEL or was it solely what this guy thought?

Originally Posted by RecursiveL

I'm quite torn between doing this muffler mod and just putting the stock exhaust back on. I've got the Borla catback and while I like the sound, the 2k RPM drone just kills it for me. I've done everything, sound deadening material, added venturis which helped, but it's still there.

Personally, it kills the dual nature of the car for me to have that drone. Does putting on the stock mufflers back on eliminate the drone?