Compression Ignition Addict
Join Date: Jul 2012
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K&N is no good for diesel.
S&B is good for diesel but more expensive.
People do the 6637 cause it is inexpensive and still filters great. Also allows much more air in than the stock airbox.
You might be able to hear your turbo a bit more, maybe a slightly louder whistle but you wont notice a huge difference.
I put the 6637 on my rig and did a straight pipe at the same time and noticed about 1.5 more MPG.
2000 F-250 XCLB 4x4 6 Speed, PIS 175/80's, ARP's, 910's, CNC Fuel Lines, 6637 Intake, GTP38R WW2, 4" turbo back, Hydra with Powerstruck and PHP tunes. International Up-pipes, ISSPRO Boost, EGT, HPOP and Fuel Pressure gauges. SB Clutch. MB Diesel HPOP.
Future Parts: Trac bars