I wanted to hear from people who have installed a TRD, magnaflow, borla, etc. muffler on their 4.0L's.
My first vehicle was a Ford F-150 with a 5.0 V8 and I had a 40 Series Flowmaster muffler installed. I noticed some definite low-end tq loss with the muffler. I seemed to gain more sound than performance from the muffler. But what a sound it was--I had dual turndowns so when I stomped on it, it was a symphony to my ears!
My next vehicle was an '02 Ford Ranger FX4 with a 4.0 V6. I decided to go with a magnaflow muffler for that truck and noticed a bit of off-the-line power loss but a nice little bump in mid-range "seat of the pants" power. Exhaust note was nice, sporty without being "raspy or ricey".
I'm very happy with my Tacoma's off the line pep and I don't want to sacrafice any of that with an aftermarket muffler. And now that I'm a bit older, I don't need car alarm inducing sound. I just want performance and mpg increases. Can anyone chime in as to whether they have experienced a difference in off-the-line performance with aftermarket exhaust, either positive or negative? Thanks!