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Absoluteley. Huge drop in EGT, faster turbo spoolup and they sound great. I have the JRE kit and i love it. If your only going to do one thing to your truck aside from gauges, a 4" exhaust should be it.
What part of the country you live in? Basically what I am getting at is what is your altitude. Are you going to modify the truck at all? What RPM (and or gear ratio) you typically see going down the highway?
Yes to me the 4" exhaust was worth the money, I just liked the way it sound. In most cases it will lower EGT and provide slightly faster spoolup.
If your only going to be really mild (small timing box or 275injectors) on upgrades or even leaving it stock, I would try dropping the muffler off and going 3" straightpipe to see if thats what your after. But if you intend to do a box and or injectors then the exhaust would definatly be worth it.