Straight pipe on 05 Dmax

[TBrake]

I put a 4" flo pro exhaust on my 05 CC. I put straight pipe the whole way. I heard from some cummins guys that I would have been better to put a straight through muffler to create a little back pressure. Just wondering about this on the Dmax.

[txguppy]

Hey, TB what's it sound like at idle and Hwy cruising 65-75mph? Any drone at any speed?
Thanks

[TBrake]

At idle the exhaust makes a hissing sound when cold and a slight exhaust tone once warm. At full throttle it is pretty loud, but sounds good. Cruising on the highway is very quite until about 75 and above. I think the exhaust is probably most noticeable at about 55-60.