Compression Ignition Addict
Join Date: Nov 2011
Location: Pacifica, Ca
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Go with a turbo back exhaust. 4" is all you really need, but if you want it to be a little louder and throatier get a 5". Both kits will come with a 4" down pipe and then either stay 4" or expand to 5". You can also get a straight pipe or with a muffler. Again thats all on personal preference if you want it to be loud or quiet.
Theres a lot of websites that you can get both set ups in both sizes for under 400 bucks. It starts getting pricey when your looking at MRBP and name brands. Look into Diamond eye. They're cheap and work great. I just ordered my 5" turbo back exhaust no muffler for $275 from RolLin Smoke Diesel.
Just shop around and see what you find. A lot of people go with the 4" exhaust but a lot also say they should have gone 5". But there is no difference in either until you start running high HP numbers or tow a lot, the 5" will keep the EGTs down a little bit.
2006 F250 Fummins with Allison Transmission
Fully loaded with all the goodies
Dreaming of: Injectors, Twin turbos, Dual cp3s, and all new custom tunes
Planning for: 2011+ front end conversion and American Force rims